65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual
Chapter 8: RS-485 Modbus Output
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Register 35
Register 35 is calibration timeout in minutes (5, 10, 15, 20, 25, or 30).
Register 36
Register 36 is calibration month (upper byte) and day (lower byte).
This is zero based (e.g. January=0 and the 1st=0).
Register 37
Register 37 is the calibration year.
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 manual
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 60.
