65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual
Chapter 8: RS-485 Modbus Output
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Register 3
Register 3 is the supply voltage (0.1 volt per count).
Registers 4 - 11
The 16 bytes in these registers contain the same ASCII text information that is displayed on the
M2A-XL’s OLED display (not NULL Terminated).
Register 12
Register 12 is the range (full scale readout).
Register 13
Register 13 is the alarm 1 set point.
The decimal point location is the same as specified in Register 1.
Register 14
Register 14 is the alarm 2 set point.
The decimal point location is the same as specified in Register 1.
Registers 15 - 19
Registers 15 - 19 are the Gas Name ASCII String (NULL Terminated).
Registers 20 - 22
Registers 20 - 22 are the Gas Units String (NULL Terminated).
Register 23
Register 23 is the alarm 1 trigger.
0=Decreasing
1=Increasing
Register 24
Register 24 is the alarm 1 normal relay state.
0=Normally De-Energized
1=Normally Energized
[2]
Fail Relay Status
0 = Not Energized
1 = Energized
[1]
Alarm 2 Relay Status
0 = Not Energized
1 = Energized
[0]
Alarm 1 Relay Status
0 = Not Energized
1 = Energized
Table 11: Register 2, Operating State, Alarms & Relays Bit & Field Assignments (Continued)
Bit(s)
Value
