Wiring - GMP231

GMP231 User Guide

Document code
M211501EN
Revision
E
Language
English (United States)
Product
GMP231
Document type
User guide

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 CO2 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 1. GMP231 connector pinout
Male 8-pin M12 Pin # Function
1 I2C SDA
2 RS-485 D-
3 I2C SCL
4 Analog output +
5 Standby
6 RS-485 D+
7 Power supply +
8 Ground
- Shield

Vaisala’s standard connection cable for the GMP231 (item 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 2. Cable
Female 8-pin M12 Pin # Function Wire color
1 I2C SDA White
2 RS-485 D- Brown
3 I2C SCL Green
4 Analog output + Yellow
5 Standby Gray
6 RS-485 D+ Pink
7 Power supply + Blue
8 Ground Red
- Shield Black