Owner`s manual

Appendix C: RS232/RS485 Adaptor Cables
C-2
RS232 Function 8-pin
Connector (on
RTU)
25-pin Female 9-pin Female Direction
RTS
5 ←
4 7 from DTE
CTS
8 →
5 8 to DTE
DSR
7 →
6 6 to DTE
GND 4 7 5 -
DTR
3 ←
20 4 from DTE
DCD (Rec line)
6 →
8 1 to DTE
To extend the cable, you may use any extension cable with male and female D-type connectors
(connected pin-to-pin, not crossed).
Note: When a User port is defined as Computer/Terminal with DTR support:
The RTU will not transmit unless it receives DTR=ON from the computer/terminal.
The RTU will not receive unless it receives RTS=ON from the computer/terminal.
Connection to a Modem
To connect one of the RTU RS232 ports to an RS232 modem, use one of the adaptors provided
in kit FLN6458B (option V213AE):
• 9-pin adaptor for Async (#0189968V32)
• RS232-E adaptor (#0189968V33) as in Connection to IDEN Radio below.
• RS232-E+ adaptor (#0189968V34) as in Connection to TETRA Radio below.
The asynchronous adaptor (#0189968V32) ends with the male 9-pin D-type connector. The
port may be defined either as a MDLC protocol port or as a User port.
The signals that appear on the male 9-pin D-type (or 25-pin) connector are according to the
RS232 standard – see the following table. In this case, the RTU serves as DTE (Data Terminal
Equipment).
RS232 Function 8-pin
Connector(on
RTU)
25-pin Male 9-pin Male Direction
TX-DATA
1 →
2 3 from RTU
RX-DATA
2 ←
3 2 to RTU
RTS
6 →
4 7 from RTU
CTS
3 ←
5 8 to RTU
GND 4 7 5 -
DTR
8 →
20 4 from RTU
DCD (Rec line)
5 ←
8 1 to RTU