Model S4000CH
48
Baud Rate
Value
Value(Hex)
Access
2400 24
18
Read/Write
4800
48
30
Read/Write
9600 96
60
Read/Write
19,200
192
C0
Read/Write
Table 14: Com2 Baud Rate
Exception: If the baud rate is not in range, an illegal data value (03) is returned.
6.8.19 Com2 Data Format (14h)
A read command returns the current data format for Com2. A 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
Table 15: Com2 Data Format
Exception: If the data format is not in range, an illegal data value (03) is returned.
To restore serial bus defaults:
Hold the reset input low and turn on the power
Address factory default is 2
Baud rate factory default is 19,200.
Format factory default is 8-N-1.
6.8.20 Calibration Level (15h)
A read returns the current settings for the calibration level. A write changes the calibration
level that will be used during the next and subsequent calibrations. Valid levels are 25 to 90.
6.8.21 Reset Alarms (16h)
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 set point.
On the S4000CH it will also reset the latching over-range function provided the gas level is
below 100% LEL.
6.8.22 Sensor Life (17h)
A read returns the current estimate of remaining sensor life in percentage.
