Co2meter iSense CM-0180, Руководство пользователя, Страница: 7 / 11

iSense Oxygen Transmitter – Manual CO2Meter.com
Rev. 27 October 2014 Pg. 13 of 21
Terminals Connectors
1. VDC = G ‐ G+
2. O2 4 ‐ 20mA = SIG GND
3. RS ‐ 485 INTERFACE = A B GND
4. RESET = RST
Modbus / RS-485
The sensor supports MODBUS protocols over RS ‐ 485 with
unidirectional transmission at 9600kbps.
The following Modbus registers are available:
iSense Oxygen Transmitter – Manual CO2Meter.com
Rev. 27 October 2014 Pg. 14 of 21
Input Registers
1. O2 Value, x10
2. Raw ADC Value
Holding Registers
1. O2 Span Value (4 byte floating number, part 1)
2. O2 Span Value (4 byte floating number, part 2)
3. O2 Pot Value
4. 4 ‐ 20mA output Zero Value
5. 4 ‐ 20mA output Span Value (4 byte floating number, part 1)
6. 4 ‐ 20mA output Span Value (4 byte floating number, part 2)
7. Control Register
8. Status Register
The following commands are available:
0x03 – Read Holding Register
0x04 – Read Input Register
0x06 – Write Holding Register