SATELLINE-3AS
User Guide, Version 2.3
16
2 SERIAL INTERFACE
The radio modem is referred to as DCE (Data Communication Equipment) whereas the PC is
referred to as DTE (Data Terminal Equipment). SATELLINE-3AS radio modem includes a 15-pin
‘D’-type female connector, which contains all the connections required to establish
communication between the radio modem, acting as the DCE, and the PC, acting as the DTE.
All EMC-requirements set forth by authorities have been taken into account in the design of the
radio modem. The radio modem user is thereby not required to take any special actions
regarding EMC-shielding (of the radio modem).
The radio modem contains two separate serial ports, which are designated P
Port 1 and P
Port 2.
Only one port at a time can be used for communication.
Port 1 complies always with the RS-232 standard.
Port 2 can comply either with the RS-232 or RS-422 and RS-485 standards. RS-422 and RS-485
differ only in the external connections. The interface type (RS-232 or RS-485/422) of P
Port 2 is
fixed at the factory at the time of manufacture according to the customer order. It is not possible
to change the interface type of port 2 afterwards.
NOTE!
WHEN THE MODE-PIN (PIN 12 OF THE D-CONNECTOR) IS CONNECTED TO
GROUND, THE RADIO MODEM IS IN THE PROGRAMMING MODE AND P
Port 1 (PINS
7,9,11) IS THEN IN USE! If you normally use P
Port 2 for data transmission, the serial cable
must be changed to a suitable type when switching over to the configuration mode.
