Campbell Scientific CS125 Present Weather Sensor User Manual
Page 20
CS125 Present Weather Sensor
12
Connector A
Five way connector
Pin number
Description
Notes
Pin 1
+12V
Main electronics 12V supply input (also supports 24V DC)
Pin 2
0V
Auxiliary Electronics 0V. Common with the main electronics 0V.
Pin 3
Hood low
Hood heater –V input, this input is totally separate to the main
electronics 0V within the sensor so can be connected to a separate
power supply. However, this pin should not be more than 5V
different from the main electronics 0V.
Pin 4
0V
Auxiliary Electronics 0V. Common with the main electronics 0V.
Pin 5
Hood high
Hood heater +V input (Normally 24V)
Connector B
Three way connector
Pin number
Description
Notes
Pin 1
0V
0V connection for serial communications. This connection is
common with the main electronics 0V (Connector A, pin 2).
Pin 2
Receive
RS232 receive line. Also, acts as the Y transmit line in RS485 half
duplex mode and the A receive line
Pin 3
Transmit
RS232 transmit line. Also, acts as the Z transmit line in RS485 half
duplex mode and the B receive line
Connector C – USER ALARMS
Four way connector
Pin number
Description
Notes
Pin 1
0V
0V connection for user alarms. This connection is common with the
main electronics 0V (Connector A, Pin 2).
Pin 2
User 2
Output for user alarm 2
Pin 3
0V
0V connection for user alarms. This connection is common with the
main electronics 0V (Connector A, Pin 2).
Pin 4
User 1
Output for user alarm 1
CS215 Connector
Three way connector
Pin number
Description
Pin 1
+12V
Pin 2
SDI-12
Pin 3
0V
To use these connections it is necessary to either use the cable gland
taking the hood heater power or, if the hood heater is also required,
to use different cables to those supplied. Please contact Campbell
Scientific if you need any advice on choice of cable.
NOTE