Watlow 8PID Controller - Manual (Page 48)

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3. COMMAND SUMMARY
All AEX commands are prefaced by the character 'X' to identify it as an "eXpander" card
command.
I/O lines are addressed from 00 to 21 to correspond with I/O Module Board designations.
When writing to all outputs with a single command (See Section 3.8) a bit position is
reserved for all 22 lines regardless of whether they are inputs or outputs. The
unnecessary bits will not affect the status of input lines.
3.1 MODE SELECTION
XM(m) m is either A to select Alarm Mode
or C to select Control Mode
Example:
Command: XMA
Response: XMA
To query the current AEX mode setting:
Command: XMQ
Example:
Command: XMQ
Response: XMC
The controller will read the default mode from EEROM memory on power-up and is
originally set to Alarm Mode. A mode selection command during operation will affect
both the run-time and stored Mode setting.
If Automatic Alarm Mode is selected, Lines 0 - 15 are considered outputs and cannot be
redefined.
3.2 ENTERING ALARM SETPOINTS
The user may enter a high and low alarm setpoint for each of the eight loops
individually. When entered, alarm setpoints are interpreted within the context of the
input type selected for that channel.