Campbell Scientific SC932C Interface - Manual (Page 7)

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-pin DCE, RS232 socket.
A.1 CABLE FOR CONNECTION TO A 25-PIN 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:
2
3
SC932C 7
20
4*
1
2
3
7 DCE Device
20
4*
Cable Shield
25-Pin D
Pin No.
25-Pin D
Pin No.
FIGURE A-1. Minimum Connections for SC932C to 25-pin DCE Interface
NOTE: 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-PIN DCE INTERFACE
Some newer modem-type devices are fitted with 9-pin D connectors designed to plug directly into 9-pin
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:
2
3
SC932C 7
20
4*
1
3
2
5 DCE Device
4
7*
Cable Shield
25-Pin D
Pin No.
9-Pin D
Pin No.
FIGURE A-2. Minimum Connections for SC932C to 9-pin DCE Interface
NOTE: The link between pins 4 and 7 marked with the * may not be required — see the section on
low power operation in Appendix B.