M2A-XL Transmitter Operator’s Manual
Chapter 8: RS-485 Modbus Output
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Register 38
Register 38 is the calibration outcome.
Upper=Gas Operation
Lower=Air Operation
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 94.
