Specifications

Quintech Electronics and Communications Inc. Protocol Version 2.15 4

SRX Series Protocol

Command Descriptions

C: Check Change Flag/Unit Status

The change flag tells the user if any crosspoint changes are in the queue. The queue will

store up to eight changes made from the local front panel keypad control. This command can

be sent periodically to check if any local changes have been made or if any alarms have

occurred. The change flag is cleared only when the queue is empty. The response will

always contain 8h as the MSD (most significant digit). The LSD (least significant digit) will be

determined as follows:

0h – No Change since last “Q” Check Queue command.

1h – At least one crosspoint has been changed locally.

2h – At least one alarm is present.

8h – The queue has overflowed.

If the queue has overflowed, all crosspoints should be queried.

Command sent:

02 XX XX 43 03 XX

STX ADR ADR C ETX CHK

Examples of positive responses:

06 XX XX 43 80 03 XX

ACK ADR ADR C 80 ETX CHK (No changes have occurred)

06 XX XX 43 81 03 XX

ACK ADR ADR C 81 ETX CHK (Changes have occurred)

06 XX XX 43 88 03 XX

ACK ADR ADR C 89 ETX CHK (The queue has overflowed)

06 XX XX 43 83 03 XX

ACK ADR ADR C 83 ETX CHK (An alarm and changes have occurred)