Vaisala GMP231 - Manual (Page 26)

User's Guide _______________________________________________________________________
24 ___________________________________________________________________ M211501EN-C
Wiring
GMP231 provides several outputs you can use. Connect the output pins
you need, and the power supply and ground pins. Use a shielded cable,
and connect the shield to the chassis of the GMP231’s M12 connector,
and to ground on the other side.
Ground pin 5 to put the probe in standby mode (stops CO
2
measurement).
The probe resumes normal measurement operation when pin 5 is no
longer grounded, unless its internal measurement shows the temperature
is too high.
Table 4 GMP231 Connector Pinout
Male 8-pin M12 Pin # Function
1 I
2
C SDA
2 RS-485 D-
3 I
2
C SCL
4 Analog output +
5 Standby
6 RS-485 D+
7 Power supply +
8 Ground
- Shield
Vaisala’s standard connection cable for the GMP231 (order code
DRW240977) is a 90 cm long cable with female 8-pin M12 connector on
one end, and open ended wires on the other. It supports all outputs from
the GMP231, and connects the cable shield to the connector chassis.
Table 5 Cable DRW240977
Female 8-pin M12 Pin # Function Wire Color
1 I
2
C SDA White
2 RS-485 D- Brown
3 I
2
C SCL Green
4 Analog output + Yellow
5 Standby Gray
6 RS-485 D+ Pink
7 Power supply + Blue
8 Ground Red
- Shield Black
Power Supply
The supply voltage range of the GMP231 is 11 ... 30 VDC.
If the analog output is used, the supply voltage range is 20 ... 30 VDC.
The maximum power consumption is 1 W.
1
5
6
7
3
4
8
2
1
6
8
7
3
4
5
2