7526 Ethernet-Serial-Parallel Guide

The 7526 Data Collection Terminal may utilize one of these communications adapter cards which allow expanded connections to server and/or peripheral devices:

7526 Ethernet Serial-Parallel (ESP) Adapter
7526 Serial-Parallel (SP) Adapter

The Ethernet Serial-Parallel Adapter provides:

10baseT and 10base2 Ethernet II/802.3 LAN connection at 10Mb/s.
Internet Protocol (IP) (commonly referred to as TCP/IP) support for connection to a data collection terminal server using User Datagram Protocol (UDP) sockets. Application-level protocols provided by the 7526 and its server add to the UDP sockets to provide reliable end-to-end communications.
Two RS-232 serial ports for connection to downstream peripheral devices, such as scales, printers, calipers, and so forth.
An auxiliary parallel printer port (that allows the standard parallel port on the 7526 to be used for digital input/output).

The Serial-Parallel Adapter provides the following.

Two RS-232 serial ports for connection to downstream peripheral devices, such as scales, printers, calipers, and so forth.
An auxiliary parallel printer port (that allows the standard parallel port on the 7526 to be used for digital input/output).

The UDP/IP sockets support built into the Ethernet Serial-Parallel Adapter allows the 7526 terminal to be connected to the Ethernet LAN at any location in an IP Internetwork. IP protocols take care of routing datagram packets between widely separated 7526 DCTs and the data collection server. A server at one location may control and receive transactions from terminals located at many different locations on the Internet network.

The IBM Data Collection Connection (DCConnect) and Data Collection Control/2 (DCC/2) 32-bit runtime version 1.11 program products provide server/controller support for LAN-attached 7526 terminals. Once the IP configuration data is set up in DCConnect or DCC/2 and in the 7526 terminal existing DCC/2-7526 applications will work without any changes.

Refer to the 7526 Programming Technical Reference, SC28-9629-03 for complete details of how a TCP/IP-equipped server can be used to download and control and receive transactions from a 7526 terminal that has the ESP card.

7526 Machine Prerequisites

One of the following communications features can be installed in any IBM 7526 Data Collection Terminal that has the following characteristics.

For the Ethernet-Serial-Parallel Adapter, at least 128KB of SRAM memory must be installed on the 7526 processor card. 7526 model 100 and 150 terminals require installation of at least 1 unit of the 7526 128KB Memory Expansion option (Feature Code 5296). 7526 models 155 and 200 have sufficient SRAM as standard equipment.
The Serial-Parallel card works with the standard memory shipped in any 7526 terminal.
Note:
This must be provided by the customer, since IBM only sells the communications cards in conjunction with a new 7526 terminal.
Version V3.00 or later microcode. Units that meet the following condition can be easily upgraded with new microcode.
A processor card with an expansion adapter slot. You can determine if the unit has this by checking for -PRT text on the terminal's display when the microcode copyright data is shown, or by observing whether the unit has a surface-mount technology processor card with P3 expansion connector.
A rear metal cover that has a removable rectangular expansion slot cover.

Note:

Items 2 through 4 are covered automatically (assuming you have kept the communications adapter with the terminal with which it was shipped).

Installing the Cards

:warn. Do not open the static-protective package containing the adapter until instructed to do so. Static electricity can damage the adapter if these handling instructions are not followed:.

Touch the static-protective package containing the adapter to a grounded metal surface for at least 2 seconds. This action reduces any static electricity from the packate and from your body.
Do not touch any exposed circuitry on the adapter.
Do not place the adapter on a metal table.
Prevent other people from touching the adapter.
Limit your movement, because movement can cause static-electricity build-up.
Always handle the adapter carefully and by its edges.
If you must put the adapter down after it has been removed from the package, place the adapter on the static-protective package on a flat surface.

:ewarn.

Note:

The ESP and SP adapter cards extend approximately 60 mm (2.4 in.) behind the standard 7526 rear metal panel. Cabling then requires additional room beyond that for the connector shell and cable bend radius. 7526 models 100, 150, and 200 have a lot of flexibility in how they are mounted so this extended depth is not usually a problem. The 7526-155 however has little room inside the confines of its cover set. Ethernet connections can be made without exceeding the envelope of the cover set, but printer and serial port cables do not have room. When printer or serial cables are connected to the adapter, you must provide a recessed area approximately 75 mm (3 inches) deep underneath (desk-mount) or behind (wall-mount) the 7526-155 mounting base to provide cable clearance.

To install the ESP or SP communications card in the 7526, perform the following steps.

Refer to the instructions in the 7526 Installation, Operation and Problem Determination manual and install any of the following internal options for the 7526 terminal:
- Memory chips
- Coprocessor chips
- NiCd Operational Battery Pack
- Keypad label legend strips
Re-install the main rear cover on the back of the 7526 terminal.
Remove the two M4 hex-head screws that hold the long rectangular cover over the expansion slot on the rear cover. Remove the long rectangular cover (you should save it in case this 7526 is ever re-configured without a communications card option).
Remove the ESP/SP communications card from its protective package. Hold the card so the markings on its metal bracket are on the top of the part. Lower the card into the 7526 expansion slot, using the 2 mounting holes in the ends as aiming guides. The markings for the connectors of the card and the connectors on the 7526 rear cover should both be visible. The card is keyed and only goes in one way.
Push the card in until it seats fully and the card bracket comes in contact with the 7526 rear cover.
Replace the two M4 hex-head screws and tighten firmly (to about 5 in-lbs. of torque).
Complete installation of the terminal, including mounting it to a fixed surface and connection of all external cables.

Refer to "Configuring the Terminal" for differences in the menu-driven terminal set-up when using the Ethernet-Serial-Parallel adapter.

Ports and Cabling

The Ethernet II DIX/802.3 ports include the industry-standard BNC connector for 10base2 thin coax and RJ-45 connector for 10baseT twisted pair cabling. Use industry-standard Ethernet cabling, connectors, hubs, bridges, routers, and so forth with your 7526 ESP card.

The serial ports and the parallel port utilize standard IBM personal computer connector styles (DB9 males and DB25 female) and pin assignments, allowing use of typical personal computer peripheral cabling that is available from many sources.

The serial ports are marked 1 and 2, along with the personal computer serial port signal graphic. The parallel printer port is marked with a graphic of a PC printer. The 10baseT and 10base2 Ethernet LAN ports are clearly marked. :cp The RS-232 port pin-outs are: .

   Pin          Function
    1           DCD
    2           RD
    3           TD
    4           DTR
    5           SIG GND
    6           DSR
    7           RTS
    8           CTS
    9           RI

Attaching the 7526 to the Network

This section applies to Ethernet connections only. Refer to the 7526 Installation, Operation, and Problem Determination and 7526 Hardware Information and Site Preparation manuals for details of RS-485 networks.

When attaching the 7526 to the Ethernet network, follow the standards set by the Institute of Electronic and Electrical Engineers (IEEE) and the ANSI standard 802.3.

Cabling 10baseT Networks

The 10baseT Ethernet port is a RJ-45 modular connector; although it looks much like a modular telephone or modem RJ-11 connection, never attempt to plug a telephone cable into the 10baseT connector. Damage to the connector could result.

Note:

10baseT, which uses unshielded twisted pair cabling, is not recommended for installations with much EMI/RFI interference (for example harsh industrial environments). The 10base2 cabling system offers higher immunity to ambient electromagnetic noise.

Hardware Requirements

The following is a list of commercially-available hardware you will need to attach a 7526 to a 10baseT network.

UTP cable to attach each device to the twisted-pair hub
The cable requirements and limitations are as follows.
- The cable must have RJ-45 connectors on both ends. Refer to "The RJ-45 Connector" for more details. The cable used is 22 to 26 AWG unshielded twisted pair (standard telephone wire), at least Category 2 with two twists per foot. Category 3 or 4 is preferred, while Category 5 is too much for 10Mb/s speeds, but it will work.
- The maximum length of twisted-pair cable segment between the hub (concentrator) and the 7526 (or other workstation) is 328 feet (100 meters). Workstations are attached in a star configuration about this hub. Only one workstation may be located at the end of this cable.
  Hubs may be in star configurations from other hubs or may be located on a backbone (10 base2 or 10base5).
A twisted-pair hub (concentrator) port for each cable segment

The RJ-45 Connector

The RJ-45 connector has 8 pins which are connected as described in the table below.


+===========+====================+===============================================+
|    Pin    | Symbol             | Function                                      |
+===========+====================+===============================================+
|     1     | TD+                | Transmit Data Plus                            |
+-----------+--------------------+-----------------------------------------------+
|     2     | TD-                | Transmit Data Minus                           |
+-----------+--------------------+-----------------------------------------------+
|     3     | RD+                | Receive Data Plus                             |
+-----------+--------------------+-----------------------------------------------+
|     6     | RD-                | Receive Data Minus                            |
+-----------+--------------------+-----------------------------------------------+
|    4,5    | NC                 | Not Connected                                 |
+-----------+--------------------+-----------------------------------------------+
|    7,8    | NC                 | Not Connected                                 |
+-----------+--------------------+-----------------------------------------------+

Cabling 10base2 Networks

The 10base2 Ethernet port features a bayonet connector (BNC). This connector uses thin, 50-ohm coaxial cable (RG58A/U), attached via a BNC T-connector.

Hardware Requirements

The following is a list of commercially-available hardware you will need to attach a 7526 (or other workstation) to a 10base2 network.

A 50-ohm 10base2 coaxial cable (RG58A/U) for each connection
Signal repeaters for extending the network cable to two or more segments, if needed.
A BNC T-connector for each 7526 or other workstation on the segment
Two 50-ohm coaxial cable terminators for each cable segment. These are plugged into the unused part of the T-connector at each end of the segment.
BNC barrel connectors, if needed, for connecting two cable segments together.

Attaching the BNC T-Connector

Beginning with the first two workstations in the network, follow the instructions below.

Attach a BNC T-connector to the BNC connector on the 7526 or other workstation. The T-connector must be plugged directly into the BNC connector on the adapter card. No cable is allowed between the T-connector and the card's BNC connector.
Connect one end of the coax cable to an open end of the BNC T-connector on the first 7526/workstation. Connect the other end of the cable to the BNC T-connector on the second (next) 7526/workstation. The minimum length of this interconnecting coax cable is 0.5m (1.6 feet).
Continue connecting 7526s/workstations in this manner until all workstations are connected. If the interconnecting cabling exceeds 185 meters (607 feet) or if the number of connections exceeds 30 devices, then use a signal repeater at the 185-meter (607 ft.) point and then attach another network segment. A maximum of 2 signal repeaters is allowed between devices. More than 4 repeaters connecting 5 segments is not allowed without signal regeneration (an Ethernet bridge is often used to provide this regeneration). The maximum length of the cabling is 925m (3035 feet) without any regeneration of the signal.
Attach a 50-ohm terminator at the open end(s) of every network segment. To reduce radiated noise from the LAN, ground one of the terminators to the middle screw of an AC power outlet.

Configuring the Terminal

Serial-Parallel Card

With a Serial-Parallel card installed, the 7526 terminal set-up menus are unchanged from those described in the 7526 Installation, Operation and Problem Determination(IOPD) manual. Setting of baud rate, and so forth, for the RS-232 serial ports is accomplished either through parameters in the File 0, Record 0 configuration record that is downloaded to the 7526, or using a Custom Function Routine (CFR) function call.

The Data Collection Control/2 Terminal Configuration program does not allow setting of RS-232 parameters for the 7526. It sets the configuration bytes that correspond to the 7526 RS-232 port settings to all zeros. If the 7526 finds all zeros in these configuration bytes, it uses a default configuration of 9600 bits/second, no parity, 1 stop bit, and 8 data bits for both Serial 1 and Serial 2 ports.

Ethernet-Serial-Parallel Card

The ESP card presents several setup menu items that are not described in the 7526 Installation, Operation, and Problem Determination manual, but refer to this manual to get information on the purpose of the Setup Mode and how to use the terminal keys to operate the menus.

With the ESP card, the first menu item is the SERVER configuration item (instead of the ADDR- prompt). See to the table below as you configure each setting.

When inputting IP addresses or netmasks on the 7526, use the following special keys.

On all but the 7526 model 100, use the numeric keypad to input the dotted decimal IP values. Use the Shift key followed by '9' to get the decimal point.
On the 7526 model 100, which has no numeric keypad, the numeric values and decimal point are input using a spinner function for each digit and decimal point. After the prompt for the item is shown briefly, the 7526-100 display clears and you can use the F1 (up) and F2 (down) keys to spin to the desired value. Then press F3 to lock in that digit and move to the next digit.
Note:
A zero is automatically filled in to the next digit position. However, it is not accepted as part of the IP address data until you press the F3 key. This last zero will be discarded if you simply press Enter.
For all models, press Enter when you have finished selecting or inputting a value.
Use Shift followed by Clear key to clear any IP value you have started to input so you can correct any error.


+==============+==============+========+===========+====================+
| Configuratio | Prompt       | User   | Default   | Available          |
|    n Item    |              | Value  | Value     | Parameters Values  |
+==============+==============+========+===========+====================+
|     Data     | SERVER:      |        | RS-485    | RS-485, 10baseT,   |
|  collection  |              |        |           | 10base2            |
|    server    |              |        |           | Selecting RS-485   |
|  connection  |              |        |           | causes the         |
|  port to be  |              |        |           | Ethernet ports to  |
|     used     |              |        |           | be ignored and the |
|              |              |        |           | terminal will use  |
|              |              |        |           | the RS-485 serial  |
|              |              |        |           | port for           |
|              |              |        |           | communications to  |
|              |              |        |           | the server and the |
|              |              |        |           | remaining          |
|              |              |        |           | configuration      |
|              |              |        |           | items in this      |
|              |              |        |           | table will be      |
|              |              |        |           | ignored. Selecting |
|              |              |        |           | 10baseT (the RJ-45 |
|              |              |        |           | connector) or      |
|              |              |        |           | 10base2 (the BNC   |
|              |              |        |           | coax connector)    |
|              |              |        |           | causes the 7526 to |
|              |              |        |           | use TCP/IP         |
|              |              |        |           | protocols over the |
|              |              |        |           | selected Ethernet  |
|              |              |        |           | port type.         |
+--------------+--------------+--------+-----------+--------------------+
|  Terminal's  | IP ADDR:     |        | None      | Any valid IP       |
|  IP address  |              |        |           | address, input in  |
|              |              |        |           | 'dotted decimal'   |
|              |              |        |           | format (e.g.       |
|              |              |        |           | 9.86.96.7 ,        |
|              |              |        |           | 124.376.45.200,    |
|              |              |        |           | etc.). Refer to    |
|              |              |        |           | the appropriate    |
|              |              |        |           | section assign an  |
|              |              |        |           | IP address to each |
|              |              |        |           | terminal.          |
+--------------+--------------+--------+-----------+--------------------+
| Sub-network  | NETMASK:     |        | None      | Any dotted decimal |
|     mask     |              |        |           | IP sub-network     |
|              |              |        |           | mask pattern (for  |
|              |              |        |           | example:           |
|              |              |        |           | 255.255.240.0 ).   |
|              |              |        |           | This is determined |
|              |              |        |           | by the number of   |
|              |              |        |           | bits in the 32-bit |
|              |              |        |           | IP address that    |
|              |              |        |           | are used to        |
|              |              |        |           | identify the       |
|              |              |        |           | network and subnet |
|              |              |        |           | versus the host    |
|              |              |        |           | (for example:      |
|              |              |        |           | 7526) address on   |
|              |              |        |           | that network and   |
|              |              |        |           | subnet.            |
+--------------+--------------+--------+-----------+--------------------+
|   Default    | DEFAULT      |        | None      | Any valid IP       |
| Router's IP  | ROUTER:      |        |           | address, input in  |
|   address    |              |        |           | 'dotted decimal'   |
|              |              |        |           | format, that tells |
|              |              |        |           | the 7526 the IP    |
|              |              |        |           | address of an IP   |
|              |              |        |           | host that performs |
|              |              |        |           | routing functions  |
|              |              |        |           | when the 7526      |
|              |              |        |           | finds that the     |
|              |              |        |           | server is not on   |
|              |              |        |           | the same network   |
|              |              |        |           | as itself. (For    |
|              |              |        |           | example: 9.86.96.1 |
|              |              |        |           | , 124.376.45.2,    |
|              |              |        |           | and so forth).     |
+--------------+--------------+--------+-----------+--------------------+
|   Menu now   |              |        |           |                    |
|   picks up   |              |        |           |                    |
|   with the   |              |        |           |                    |
|    TIME-     |              |        |           |                    |
|   prompt.    |              |        |           |                    |
| Refer to the |              |        |           |                    |
|     7526     |              |        |           |                    |
| Installation |              |        |           |                    |
| , Operation, |              |        |           |                    |
| and Problem  |              |        |           |                    |
| Determinatio |              |        |           |                    |
| n manual for |              |        |           |                    |
|      a       |              |        |           |                    |
| description. |              |        |           |                    |
+--------------+--------------+--------+-----------+--------------------+

Note:

If you do not see the settings for SERVER, IP ADDR, and so forth, this indicates that there is no valid terminal microcode loaded in the FLASH memory on the ESP card. In this case, refer to "Updating the FLASH Memory Programming" for instructions on how to load the FLASH memory.

Programming the Terminal

The following descriptions of programming for the serial and parallel ports applies to both the Serial-Parallel card and the Ethernet-Serial-Parallel card.

Serial Ports

Setting of baud rate, and so forth for the RS-232 serial ports is accomplished either through parameters in the File 0, Record 0 configuration record that is downloaded to the 7526, or using a Custom Function Routine (CFR) function call. The default is 9600, No parity, 1 stop bit, and 8 data bits.

Note:

Depending on the amount of data which is being transmitted and received on the RS-232 serial ports, you may or may not be able to use the ports at the higher speeds (e.g. 9600 or 19200 bps). If the terminal appears to be missing incoming characters, or your attached device is timing out while waiting to receive characters, or if the terminal is not responsive to other inputs (e.g. digital input counting, bar code/magnetic scanning, host communications, keypad input), then this indicates that the 7526's processor is overloaded with interrupts and that you need to slow the baud rates or reduce the frequency of other inputs (such as digital input counts or scanning speeds).

Transmitting and receiving on the RS-232 serial ports is accomplished only by using CFR function calls (ComWrite and ComRead). ComGetMdmCtl and ComSetMdmCtl functions are available to read and set modem control lines (RTS, CTS, DTR, and so forth). The ComInit function is used to set the baud rate, parity, and so forth for each port. Refer to the 7526 Programming Technical Reference manual SC28-9629-03 (4th edition) for details. An enhanced CFR programming library and C header file comes with this manual to support use of these programming application interfaces. These programming support files are also available for download from the IBM Data Collection World Wide Web site at http://wwprodsoln.bocaraton.ibm.com/dc . A sample Custom Function Routine that supports the RS-232 serial ports is included with the package.

Parallel Port

Printing on the parallel port is accomplished by using the existing 7526 printing functions: SEND to PRINTER in transaction programs, and the various CFR PrtXxxx APIs. When a SP or ESP card is installed, all printing is routed to the option card's parallel port rather than the parallel port which comes standard with later-production 7526 terminals. Therefore, you can set the parallel port configuration for the terminal's standard port to be a digital input/output setting and use the option card's port for printing. The option card's parallel port is always a printer port. DI/DO is currently not supported.

Ethernet TCP/IP Ports

Application programming in transaction programs and Custom Function Routines in the 7526 terminal are not aware which hardware port and network protocol is being used. Traditional RS-485 serial and Ethernet TCP/IP server connections look the same. This also applies to the transaction export applications that are fed by the data collection controller/server program, since existing applications can work unchanged with the new TCP/IP network connection.

Any computer with TCP/IP UDP sockets support can be a server to 7526 terminals on the network. Considerable programming is required to properly serve the configuration, program files to the 7526, and to handle transactions generated by the 7526. IBM currently offers two program products that serve this function:

Data Collection Control/2, 32-bit Runtime, Version 1.11
Data Collection Connection for OS/2 (DCConnect)

Co-requisite TCP/IP protocol products are required to provide these data collection controllers with UDP sockets support.

Ethernet-Serial-Parallel Indicator Lights

The Ethernet-Serial-Parallel card has 3 indicator LEDs that are visible through a rectangular opening in the card's bracket. The LEDs are labeled on the top of the bracket:

GDLINK: This indicator should come on when a 10baseT cable is connected to the 7526 and that cable is connected to a functioning device (computer or 10baseT hub) at the other end.
This indicator has no function when the 10base2 (BNC coax port) is configured for use instead of the 10baseT port.
RX: The 7526 is receiving data on either the 10baseT or 10base2 port.
TX: The 7526 is transmitting on either the 10baseT or 10base2 port.

*******************************************************************************

Determining IP Addresses

Many of the parameters required for network configuration are IP addresses. The system administrator must assign a unique IP address for each connection from an internet host (hosts are any device on the network, for example: a 7526 with ESP card, a PC running DCConnect and TCP/IP) to a network.

The IP address is a two part address as follows:

The network address assigned when connected to the internet. This is one, two, or three decimal numbers (octets) separated by periods.
A unique local address for each host that connects to the network. Assign each host a local address number between 0 and 255.
Note:
Do not use the numbers 0 or 255 -- these are reserved for broadcast address

Combine the network address and the local address with a period between them to form the complete address.

Hosts that exchange packets on the same physical network should have the same network number.

For additional information on IP addresses, refer to your system administrator or TCP/IP for OS/2 Installation and Administration.

TCP/IP can divide a single network into multiple logical networks. For example, an organization can have a single network IP Address that is known to users outside the organization, but it can configure its local address portion of the IP address into a subnetwork number and a host number to represent different departments within the organization. The netmask is used to reserve a portion of the local internet address (IP address) for a subnetwork address. The netmask is in 32-bit dotted decimal notation as follows:

Code all 1s in the bit positions for the network portion of the IP address.
Code all 1s in the bit positions for the subnetwork number.
Code all 0s in the bit positions for the host number. The host number must be at least 1 bit.
Convert each byte to a decimal number and separate the numbers with periods. In effect, the Subnet mask field specifies how much of the local address portion of the IP address to reserve for a subnetwork address. For an installation which is small enough to not require routing between different networks, use a netmask of, say, 255.255.0.0 and then make sure all IP hosts have exactly the same numbers for the two octets (that is, for the numbers before the first two decimal points). This leaves the third and fourth octets to be used as unique local host addresses (
TCP/IP can divide a single network into multiple logical networks. For example, an organization can have a single network IP Address that is known to users outside the organization, but it can configure its local address portion of the IP address into a subnetwork number and a host number to represent different departments within the organization.
If the networks are to be connected to the Internet (for example: your LAN with attached TCP/IP workstations are to be connected through a gateway to the external, world-wide Internet), the system administrator must obtain authorized Internet addresses. The authorizing body is the InterNIC. WWW home page at http://rs.internic.net is an excellent source of information in obtaining authorized Internet domain naming and addresses.
If there are no connections to the Internet, the system administrator can design a custom addressing system (you can make up your own address numbers). If there are multiple physical networks (an internet that is isolated within your enterprise), the system should include a way to distinguish the addresses of each of the physical networks or subnets from the internet as a whole.
Note:
Never use a network address which begins with 0, 127, or any number above 223. These are reserved values in the IP protocol.

Problem Determination
```
+================================+==========================================+
|            Symptom             | Fix                                      |
+================================+==========================================+
|  "Insufficient RAM" error on   | The Ethernet-Serial-Parallel adapter     |
|          7526 display          | requires at least 128KB of RAM to be     |
|                                | installed on the 7526 processor card.    |
|                                | The terminal cannot be run with less     |
|                                | RAM.                                     |
+--------------------------------+------------------------------------------+
| Setup menus do not show any IP | Microcode version 3.0 or later is        |
|    options, or option card     | required to support both the SP and ESP  |
|   functions do not work, or    | cards. Read the LCD copyright display or |
|       terminal locks up        | the label on the EPROM inside on the     |
|                                | 7526's processor card to determine if    |
|                                | proper microcode is installed. If 3.0 is |
|                                | installed, replace the SP/ESP option     |
|                                | card.                                    |
+--------------------------------+------------------------------------------+
| The 7526 does not download or  | Verify that the SERVER port selected in  |
| does not communicate with the  | the menus matches that which is          |
|        server machine.         | connected.                               |
|                                | If using 10baseT, if the GDLINK light is |
|                                | not coming on make sure the patch cable  |
|                                | is good and that the hub is connected    |
|                                | and functioning.                         |
|                                | For both Ethernet connection types,      |
|                                | verify that the RX light flashes         |
|                                | occasionally, indicating data received   |
|                                | on the network. If there is no activity, |
|                                | check the connections and the receive    |
|                                | light on other workstations on the LAN.  |
|                                | If other workstations are showing        |
|                                | received data and the 7526 in question   |
|                                | is not, replace the ESP adapter.         |
|                                | If the RX indicator does come on, but TX |
|                                | does not, verify that the 7526's IP      |
|                                | address, netmask, and default router IP  |
|                                | address are correctly set.               |
+--------------------------------+------------------------------------------+
|   A printer attached to the    | Verify the printer is on-line. Many      |
|  serial port on the SP or ESP  | printers do not actually print anything  |
|      card does not print.      | until a carriage-return/line feed is     |
|                                | received or the sheet is full.           |
+--------------------------------+------------------------------------------+
|   A printer attached to the    | Attach the printer to the printer port   |
|   standard 7526 printer port   | on the SP/ESP adapter card. All printing |
|   does not receive any print   | is directed to this port when one of     |
|             data.              | these option cards is installed.         |
+--------------------------------+------------------------------------------+
```
Parts Catalog
The 7526 communications adapters are available as Field Replaceable Units (FRUs) (i.e. service spare parts). The following FRUs are avaiable to supplement those described in the 7526 Maintenance Information manual (SA33-7000):
- Ethernet-Serial-Parallel card with bracket: 82H5167
- Serial-Parallel card with bracket: 82H5175
Updating the FLASH Memory Programming
The Ethernet-Serial-Parallel card includes 512KB of non-volatile, field-programmable FLASH memory. This memory contains most of the 7526 terminal's operating system, the TCP/IP protocol stack, and the 7526's data collection application enabler programs. Only the initial startup code of the 7526 is run from the main processor card's EPROM storage when an ESP card is installed. This means that enhancements and defect fixes that require an EPROM change on 7526 terminals that do not have an ESP card can be done with a simple reload of the FLASH memory. (Your application transaction programs, prompts, validation files, and custom function routine are stored in the terminal's Static RAM memory, not in the FLASH memory).
To reload the FLASH memory on the ESP card, you need the following.
1. An RS-232 serial cable to connect a personal computer RS-232 port to the Serial 1 port on the ESP card. This cable must be a "null-modem" cable (meaning that it connects transmit on your PC to receive on the 7526 ESP card, and receive to transmit from the 7526 ESP card.
  For use of PCs which have a 9-pin RS-232 port, this will usually mean a cable which connects:
```
 
 PC          ESP Card
 -----       --------
 Pin 3   to   Pin 2
 Pin 2   to   Pin 3
 Pin 5   to   Pin 5
 
```
  For use of PCs which have a 25-pin RS-232 ports, this will usually mean a cable which connects:
```
 
 PC          ESP Card
 -----       --------
 Pin 2   to   Pin 2
 Pin 3   to   Pin 3
 Pin 7   to   Pin 5
 
```
2. A new FLASH load HEX file. This file will be provided by IBM via your place of purchase, an IBM support hot line, or via download from an IBM bulletin board or our support World Wide Web site at http://wwprodsoln.bocaraton.ibm.com/dc .
3. The FLASH loader program FLOAD26.EXE, which is provided with the new FLASH memory load module. FLOAD26.EXE is a DOS text-mode application. It may be run in a DOS window or full screen session under OS/2, or under the DOS operating system.
To perform the loading process, do the following.
1. Turn off the 7526 terminal
2. Connect the RS-232 cable between the Serial 1 port on the 7526 ESP card and your PC's RS-232 port.
3. Start the loader program by entering the following.
```
 
FLOAD26 filename.HEX /P:COMn
 
```
  where n is the PC port's COM number (the default is 1, for COM1). For example, to use COM2:
```
 
FLOAD26 filename.HEX /P:COM2
 
```
4. Turn on the 7526
After the loader and the 7526 recognize each other, the loader program first erases the current FLASH load and then loads the new data. The process takes several minutes. The loader displays its progress on the PC screen.
The 7526 re-starts when the load is completed.

Card Environmental Specifications
The 7526 SP and ESP cards are rated at 0 to 50°C (32-122°F) ambient temperature for operation. This limits the environment in which the 7526 terminal may be used; the 7526 by itself can operate down to -20°C (-4°F). All other environmental specifications are identical to those given in Chapter 4 of the 7527 Hardware Information and Site Preparation manual.