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Appendix C
R/F Serial Pin-outs
Base Station to Host Pin-outs
The Base Station is connected to a PC with one of the following cables:
F34 DB25 Null Modem Cable
These are the pin-outs for Cable F34, a DB25 Female to 8 pin modular
RJ45 with pins 2 and 3 crossed, used for a Base connected directly to a
25 pin male host serial port.
Mod 8 RJ45 Function DB25 Female
1 Frame Ground 1
2 Transmit Data 3
3 Receive Data 2
4 Signal Ground 7
F34 Null Modem Cable
* Modular Pins 5-8 are connected to DB25 pins 5,6,8,4 but not
used by the R/F Base.
If you are planning to use a serial extension cable of 80 feet or more, you
need to open the DB25 shell of our cable and be sure that only pins 1,3,2,
and 7 are connected. All others should be cut. This is necessary to keep
Windows from following noise transitions as handshaking transitions that
can severely degrade the application or even crash Windows.
F36 DB9 Straight Cable
These are the pin-outs for Cable F36, a DB9 Female to 8 pin modular RJ45.
This cable is used to connect the Base to a 9 pin Male host serial port.
Mod 8 RJ45 Function DB 9 Female
1
Shell
(chassis ground)
Shell
2 Transmit Data 2
3 Receive Data 3
4 Signal Ground 5
F36 9 pin cable
If you plan on building your own extension cables, you must use well
shielded cable and you cannot use twisted -pair cable. You can order
custom length RS-232 extension cables from Global Computer
Supplies - ph. 800-845-6225, part number ZCC4912X. Many other
companies sell 10 ft., 25 ft., and 50 ft. DB9 Extension Cables including
Radio Shack.