65-2640XL-04 M2A Transmitter Operator’s Manual
Chapter 8: RS-485 Modbus Output
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Registers 4 - 11
The 16 bytes in these registers contain the same ASCII text information that is displayed on the
M2A’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
Register 25
Register 25 is the alarm 1 relay reset.
0=Latching
1=Self-Resetting
Register 26
Register 26 is the alarm 1 ON delay.
Integer values are in seconds.
Register 27
Register 27 is the alarm 1 OFF delay.
Integer values are in seconds.
Register 28
Register 28 is the alarm 2 trigger.
0=Decreasing
1=Increasing
