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Chapter 8: RS-485 Modbus Output
65-2670XL-XX-07 M2A-XL Transmitter
Calibration Outcome Codes:
1=Sensor Missing
2=Sensor Too Weak
3=Signal Too Strong
4=Not Enough Span
5=Negative Reading
6=Span Gas Value Is Not OK
7=Calculated Zero Is Too Low
8=Calculated Zero Is Too High
9=Zero Failure
10=Span Failure
11=Calibration Is Overscale
12=LEL Sensor Offset Is Too High
13=LEL Null Operation Failed
14=Operation Not Performed
Register 39
Register 39 is the auto-zero disable.
0=AutoZero Enabled
1=AutoZero Disabled
Register 40
Register 40 is the remote configuration register access level
0=None
1=Alarm Reset
Function Code 16: Write Registers
There are 21 registers in Function Code 16 that can be used to write to the M2A-XL. This section
only describes Register 16 because it can be used to reset an alarm condition. For a complete
description of Function Code 16, see “Appendix C: Function Code 16 Registers” on page 64.
Register 16
Register 16 performs the same function as the ENTER button on the M2A-XL. It is useful for
remotely silencing alarms. With the M2A-XL in an alarm condition, bit [0] can be used to silence
it.
NOTE:
Register 40 in Function Code 03, the remote configuration register, must be set to 1 in
order for Register 16 to work.
Table 12: Register 16, Button Function
Bit
Value & Field
[0]
ENTER (used for “Alarm Reset”)
0=Not Pressed
1=Pressed
