Model S4000CH
47
To restore all serial bus defaults:
Hold the reset input low and turn on the power (F10 error may be displayed).
Address factory default is 1.
Baud rate factory default is 19,200.
Format factory default is 8-N-1.
COM 2 is user selectable to HART or Modbus if the unit is ordered with HART.
HART
or Modbus is selectable via Modbus or the display. For additional information on HART, see
the S4000CH HART manual.
When HART is selected there are changes to comply with the HART requirements. Since
HART does not allow low current the actual current does not go below 3.5 mA. Modbus
reports the analog output as if HART was not there. This allows users to use a constant
program. The digital HART reports the actual current.
Function
Current Level (mA)
Analog
Output
(Standard)
Modbus
HART
(Default)
HART
Modified
Analog Output
Start Up (SU)
4
4
4
4
Fault
0
0
3.5
1.25
HazardWatch 3.2
3.2
3.5
3.2
Cal Check
1.5
1.5
3.5
1.5
Calibrate 1.5
1.5
3.5
1.5
Gas
4-20
4-20
4-20
4-20
Over range
21.7
21.7
21.7
21.7
Negative drift (0 to -9% LEL)
2.56
2.56
3.5
2.56
Table 13: Current Chart
On HART equipped units, the user must select the HART – modified analog output in order
to use analog values that are standard with gas detection equipment.
6.8.17 Com2 Address (12h)
A read command returns the current address for Com2. A write command changes the
address to the requested values. Valid addresses are 1-247 decimal.
Factory default is 2.
Exception: If the address is not in range, an illegal data value (03) is returned.
6.8.18 Com2 Baud Rate (13h)
A read command returns the current baud rate for Com2. A write command changes the
baud rate to the requested values. Valid settings are shown in the table below.
Factory
default is 19,200.
Содержание S4000CH
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