Model S4000T
38
8.8.14 Com2 Data Format
A read command returns the current data format for Com2. Write command changes
the data format to the requested values. Valid settings are shown in the table below.
Factory default is 8-N-1.
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
Figure 35 Com2 Data Format
Exception: If the data format is not in range an illegal data value (03) is returned.
8.8.15 Reset Alarms
A write to this register with a data value of 1 will reset any latched alarms provided
the current gas level is below the alarm setpoint.
8.8.16 Sensor Life
A read returns the current estimate of remaining sensor life in percentage.
8.8.17 Sensor Scale
A read returns the current H
2
S sensor scale selected: 0-20ppm, 0-50ppm, 0-
100ppm. 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.
H2S Sensor Scale Value (decimal)
0-20 ppm 20
0-50 ppm 50
0 –100 ppm 100
Figure 36 Sensor Scale
8.8.18 Total Receive Errors
A read indicates the total Modbus Comm Receive Errors that occurred in the slave
device. The maximum count is 255 and then the counter will rollover to zero and
begin counting again.
The total errors are an accumulation of the individual communication errors listed
below:
8.8.19 Bus Activity Rate %
A read indicates the Bus Activity Rate in percent of this Slave’s addressed node
versus other addressed nodes. Range of this value is in hex (0-64) which translates
to decimal (0-100%).
8.8.20 Function Code Errors
A read indicates the number of Function Code Errors that occurred in the slave
device. The maximum count is 255 and then the counter will rollover to zero and
begin counting again.
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