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MAN-0076 Rev 05 Millennium II
December 07, 2012
Net Safety Monitoring Inc
Table 7: Modbus Registers
Concentration value as calculated by sensor
(RTUsensor_out), Channel 1
Sensor status (RTUsensor_stat), Channel 1
Temperature of sensor element housing in Kelvin
(RTU temperature), Channel 1
RFU, Channel 1, always read as 0x0000
RFU, Channel 1, always read as 0x0000
Concentration value as calculated by sensor
(RTUsensor_out), Channel 2
Sensor status (RTUsensor_stat), Channel 2
Temperature of sensor element housing in Kelvin
(RTU temperature), Channel 2
RFU, Channel 2, always read as 0x0000
RFU, Channel 2, always read as 0x0000
Concentration value as calculated by sensor
(RTUsensor_out), Channel 3
Sensor status (RTUsensor_stat), Channel 3
Temperature of sensor element housing in Kelvin
(RTU temperature), Channel 3
RFU, Channel 3, always read as 0x0000
RFU, Channel 3, always read as 0x0000
Concentration value as calculated by sensor
(RTUsensor_out), Channel 4
Sensor status (RTUsensor_stat), Channel 4
Temperature of sensor element housing in Kelvin
(RTU temperature), Channel 4
RFU, Channel 4, always read as 0x0000
RFU, Channel 4, always read as 0x0000
Initialize Quick calibration, channel 1 to 4
Initialize Normal Calibration, channel 1 to 4
NOTE: Alarm points can be set up through MPDBUS registers 40093 to 40096
Channel 1 high alarm limit
Channel 1 low alarm limit
Channel 2 high alarm limit
Channel 2 low alarm limit
RFU, Channel 3 high alarm limit
RFU, Channel 3 low alarm limit
RFU, Channel 4 high alarm limit
RFU, Channel 4 low alarm limit
*RFU – Reserved for future use
** The transmitter Status register (Register 40021) is a bit flag register. Table 8 on next page, shows the detailed meaning of
each bit in the register.
