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D-4
VRC 6940 Product Reference Guide
Null Modem
A null modem cable is used for:
!
downloading programs from a PC to a VRC 6940 terminal
!
unloading memory contents from a VRC 6940 terminal to a PC
The cable has a 16-pin male circular connector, and a 25-pin female D-Connector. Table D-
4 shows the pin-outs for both connectors.
Table D-4. Null Modem Pin Out Descriptions
VRC6940 16-Pin Circular Connector
(Male)
Host 25-Pin D-Connector
(Female)
Pin Name Pin Name
1DCD20DTR
2 RXD 2 TXD
3 TXD 3 RXD
4 DTR 6, 8 DSR, DCD
5 GND 7 GND
6DSR20DTR
7RTS5CTS
8CTS4RTS