F-901B Reference Manual
Page
9
of
15
DEV_TYPE
100
Default device type ID: 9011
FIRMWARE
101
Firmware version
Holding Registers
Mode: Read/Write, size: 16 bits
Name
Address
Default
Description
PUMP_POWER
0
50
Internal pump power 0-100%
C2H4_SPAN
1
C2H4 span calibration parameter, calculated as follow:
C2H4_SPAN = C2H4_CUR*C2H4_SPAN_CUR/C2H4_CAL
Note: C2H4_CAL: expected calibration concentration
C2H4_SPAN_CUR: Current span value
C2H4_CUR: Current C2H4 measurement
C2H4_ZERO
2
C2H4 zero calibration parameter
O2_SPAN
3
O2 span calibration parameter, calculated as follow:
O2_SPAN = O2_CUR*O2_SPAN_CUR/O2_CAL
Note: O2_CAL: expected calibration concentration
O2_SPAN_CUR: Current span value
O2_CUR: Current O2 measurement
O2_ZERO
4
O2 zero calibration parameter
CO2_SPAN
5
CO2 span calibration parameter, calculated as follow:
CO2_SPAN = CO2_CAL*CO2_SPAN_CUR/CO2_CUR
Note: CO2_CAL: expected calibration concentration
CO2_SPAN_CUR: Current span value
CO2_CUR: Current CO2 measurement
CO2_ZERO
6
CO2 zero calibration parameter
TRIGGER_INTERVAL
20
0
Interval between Trigger measurements in seconds.
Writing a value greater than 0 to this register enables
Trigger mode (see
). Writing a 0 to this
register disables the Trigger mode (switches to
Continuous mode after finishing any on-going Trigger
measurement). Note that a single Trigger mode
measurement takes at least 65 seconds.
SLAVE_ADDR
30
50
Device Modbus RTU slave address. Update this register
to change the slave address. Valid slave addresses: 0-99
MODBUS_MODE
31
0
0: TCP/IP (LED blinks 2 times at boot)
1: RTU (LED blinks 3 times at boot)
2: Auto Config Mode. During boot up, if the internal
TCP/IP cable is plugged in and the device is connected to
active ethernet hub/router or the F901C Controller, the
device will select TCP/IP mode. Otherwise, RTU mode is
selected.
IP_ADDR0
32
192
Device IP address
IP_ADDR1
33
168
Device IP address
IP_ADDR2
34
1
Device IP address
IP_ADDR3
35
50
Device IP address
IMPORTANT
:
backup calibration parameters before overwriting their values (performing a calibration) or update
device firmware (all parameters will be erased). All F-901B comes with factory calibration using standard certified
gases.
