12
Maintenance and servicing
Technical specifications
78
30302710-02-EN
V7.20141016
Pin assignment of port C
Port C is an RS232 interface
CAUTION
Damage to the equipment caused by short circuit
Pin 4 of port C is live. The voltage depends on the operating voltage of the terminal and is used to
supply the DGPS Receiver from Müller Elektronik.
Other GPS Receivers may suffer damage if connected to this port.
Before connecting a different GPS Receiver:
◦ Check what voltage the terminal is connected to (12 V or 24 V).
◦ Check the pin assignment of the GPS Receiver.
◦ Check the allowable voltage for the GPS Receiver.
◦ Compare the terminal voltage to the allowable voltage for the GPS Receiver.
◦ Compare the pin assignment.
◦ Only connect the GPS Receiver to the terminal, if the voltage range and pin assignment of both
devices don't differ from each other.
Pin assignment of port C
Pin no.:
Signal
1
DCD
2
/RxD
3
/TxD
4
Voltage supply for GPS receiver
1
5
GND
6
DSR
7
RTS
8
CTS
9
RI (+5 V)
Legend:
1
) The pin is switched in parallel with pin 4 by port B. Total loading is 600mA.
When switched on, the terminal routes current to the farm equipment that is connected via the RS232
connector. The voltage of the RS232 connector is dependent on the operating voltage of the terminal.
When connected to a 12 V battery, the terminal will transfer approx. 11.3 V to the connected
equipment.
12.5.4
