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Model S4000TH
46
Data
Parity
Stop
Format
Data(Bits 9-8)
Access
8 None
1
8-N-1 0
Read/Write
8
Even
1
8-E-1
1
Read/Write
8 Odd
1
8-O-1 2 Read/Write
8
None
2
8-N-2
3
Read/Write
Table 15: Com2 Data Format
Exception: If the data format is not in range an illegal data value (03) is returned.
8.8.21 Not Used (15H)
8.8.22 Reset Alarms (16H)
A write to this register with a data value of 1 resets any latched alarms provided the current
gas level is below the alarm set point.
8.8.23 Sensor Life (17H)
A read returns the current estimate of remaining sensor life in percentage.
8.8.24 Sensor Scale (18H)
A read returns the current H
2
S sensor scale selected: 0-20 ppm, 0-50 ppm, 0-100 ppm. A
write changes the scale to the desired scale. If the scale is changed, a calibration fault is
generated, forcing the operator to calibrate the unit.
H
2
S Sensor Scale
Value (decimal)
0-20 ppm
20
0-50 ppm
50
0 –100 ppm
100
Table 16: Sensor Scale
8.8.25 HazardWatch (Co – Calibration Output) (19H)
HazardWatch indicates when a successful calibration takes place. In HazardWatch mode, the
current goes to 3.2 mA for five seconds then to 4.0 mA. An aborted calibration would go
straight to 4.0 mA. A read to this register will return the status of the HazardWatch option.
0x01 enables this option, 0x00 disables this option, similar to the write.
8.8.26 Not Used (1A, AB, 1C H)
8.9 HART Enable (1D H)
This command enables or disables the HART. A “0” is Modbus a “1” is HART.
8.9.1 HART Test (1Eh)
This command is used to test the HART output. It produces constant zeros or constant ones
on the HART output.