Vaisala GMM220 - Manual (Page 2)

GMM220 _____________________________________________________ CO2 Transmitter Modules
M010115EN-E _______________________________________________________________________ 2
Electrical Connections
Figure 3 Electrical Connections
Power supply:
Two supply voltage alternatives:
-
+L 12 volt supply input (11 VDC - 20 VDC)
- +H 24 volt supply input (18 VDC - 30 VDC)
- GND common ground for power supply
Average current consumption is 100 mA (+ current output, max. 20 mA)
Analog outputs:
-
0 common for both analog outputs
- V voltage output (default 0-1 V, on request 0-2 V, 0-2.5 V or 0-5V)
- mA current output (default 4-20 mA, on request 0-20 mA)
Serial interface:
The interface is a 5 V (TTL) level full duplex serial port.
- GND signal ground (same potential as the supply GND)
- TX data transmitted by the CO
2
module (low state corresponding mark)
- RX data received by the CO
2
module (low state corresponding mark)
Leave other serial interface pins unconnected.
Probe wires: If the CO
2
module is ordered with a separate probe cable, solder the wires
to the component board according to colors shown in Figure 3.