User guide

A-1
Appendix A. SC932C to RS232 Device
Connection Details
This Appendix gives details of the cables required for connection of an SC932C to DCE type
RS232 devices, if the SC932C cannot be directly plugged into the 25-way DCE, RS232 socket.
A.1 Cable for Connection to a 25-way DCE Interface
A standard pin-to-pin cable is suitable. However, if a custom cable is to be made it
must make the following minimal connections:
Figure A-1 Minimum Connections for SC932C to 25-way DCE Interface
The link between pins 4 and 4 marked with the * may not be
required — see the section on low power operation in Appendix B.
A.2 Cable for Connection to a 9-way DCE Interface
Some newer modem-type devices are fitted with 9-way D connectors designed to
plug directly into 9-way serial ports as found on most ‘AT’ style PCs. Commercial
adaptor cables are available. If you use a custom made cable, it should have the
following connections:
Figure A-2 Minimum Connections for SC932C to 9-way DCE Interface
The link between pins 4 and 7 marked with the * may not be
required — see the section on low power operation in Appendix B.
NOTE
NOTE
25-Way D
Pin No.
25-Way D
Pin No.
25-Way D
Pin No.
2
2
3
2
33
23
7
7
7
5
2020
420
4*
4*
7*
4*
1
1
Cable Shield
Cable Shield
9-Way D
Pin No.
SC932C
DCE Device
SC932C
DCE Device