Reference Guide
Table Of Contents
- About This Manual
- Chapter 1 Getting Started
- Chapter 2 Installing Hardware
- Chapter 3 Configuring Spectrum24
- Chapter 4 Installing Software
- Chapter 5 Operating a VRC 6940
- Chapter 6 Troubleshooting
- Chapter 7 Maintenance
- Appendix A Utilities and Diagnostic Tests
- Appendix B Software Environment
- Appendix C Keyboard Layouts
- Appendix D Environmental and Technical Specifications
- Appendix E Communications Status Codes
- Glossary
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. Ta ble 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