7526 DCT Reference

Features

Contrast and Beeper Adjustment

contrast and beeper adjustment

Contrast and beeper adjustments can be made by using the shifted function of the following keys:

To change contrast or volume, press and release the Shift key and then repeatedly press and release the appropriate adjustment key until the desired results are achieved.

When the Shift key is pressed, the shifted state is held for 5 seconds from the latest adjustment key press.

Keylock Key

The keylock key is used with the Shift key for entering the system setup or maintenance operations.

7526 DCT keypads 
 

Figure 1. IBM 7526 Data Collection Terminal, Model 100 Keypad.

View figure.


 

Figure 2. IBM 7526 Data Collection Terminal, Model 200 Keypad.

View figure.

Alt Key&mdash.Model 100

The Model 100 Alt key allows accessing functions F5-F8 by pressing and releasing the Alt key, then pressing one of the F1-F4 keys.

Note:

Transaction programs attached to F5-F8 are accessed using the Alt key. CFR code also gets F5-F8 key codes from these combinations when using the KbdReadAscii Applications Program Interface (API) function.

User Defined Keypad Layout&mdash.Model 200

The numeric and alphabetic keys may be remapped by using File a downloaded to the terminal.

Note:

Keypad remapping is not available on the 7526, Model 100.
. 

Chapter 4. Transaction Queue Operation

This chapter describes the modes of operation for the transaction queue within the 7526 DCT. A transaction A transaction queue is a temporary storage area for transactions that have been collected and are waiting to be polled by the terminal controller. A transaction is removed from the queue after it is polled and the DCT receives an ACK(4) from the terminal controller.

The DCT communicates with the terminal controller using a either a polled, asynchronous serial ASCII protocol over the terminal's RS-422/485 multi-drop port, or via a non-polled Ethernet link using TCP/IP's User Datagram Protocol (UDP) data packets. (See Chapter 5. "Communications Control Protocol 1283" for complete details about communications protocol requirements.) The DCT builds and time stamps transactions to be sent to the terminal controller. The transaction queue operates in three modes:

The mode of the transaction queue can be set in one of two ways:
  1. Through the terminal controller command 8 (CMD 8) which sets the default mode of the transaction queue.
  2. Through byte 2 in File 0 record 0, which is the default mode of the transaction queue if a terminal controller CMD 8 has not been executed.

    3. File 0 is described in "File 0&mdash.Terminal Operating Parameters".

Note:
CMD 8 overrides the setting of byte 2 in File 0 Record 0.

Footnotes:

(4) ACK = Positive acknowledgement. ACK is a reserved ASCII character used in the communications commands discussed in this document. For additional information about ACK and other reserved ASCII characters, see Chapter 5. "Communications Control Protocol 1283".