Appendix A: Rs232 Adapter Cables; Connection To A Computer Or Terminal - Motorola MOSCAD 68P02958C00-B User Manual

APPENDIX A:
RS232 Adapter Cables
This appendix provides the information required for connecting an RTU RS232 port to various
units, as detailed below:
Connection to a computer/terminal (MDLC protocol or User Port)
Connection to a modem (MDLC protocol or User Port)
Connection to a radio (MDLC protocol)
RTU-to-RTU connection using MDLC protocol through RS232 ports (RS-Link)

Connection to a Computer or Terminal

To connect one of the RTU RS232 Ports to a computer/terminal, you should use the FLN6457
adapter, which ends with the female 25-pin or 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 female 25-pin or 9-pin D-type connector are according to the
RS232 standard – see the following table. In this case, the RTU serves as DCE (Data
Communication Equipment).
RS232 Function
TX-DATA
RX-DATA
RTS
CTS
DSR
GND
DTR
DCD (Rec line)
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:
1) The RTU will not transmit unless it receives DTR=ON from the computer/terminal.
2) The RTU will not receive unless it receives RTS=ON from the computer/terminal.
8-pin Connector 25-pin
(on RTU) Female
2
2
3
1
4
5
5
8
6
7
4 7
20
3
8
6
A-1
9-pin Female Direction
3 from DTE
2 to DTE
7 from DTE
8 to DTE
6 to DTE
5 -
4 from DTE
1 to DTE