The RAD console cable connects a PC serial port to the management port of RAD Data Communications equipment such as the FPS-8 packet switch. Both ends use 25-pin D-sub female (DB-25F) connectors wired as a null-modem crossover, carrying EIA-232 signals between the PC (DTE) and the device. The cable supports the standard console session signals: transmit data, receive data, hardware handshake lines, and signal ground.
25 pin D-SUB female connector to the computer
25 pin D-SUB female connector to the device
| PC Pin name | PC Pin | Direction | RAD switch Pin | RAD switch Pin name | Description |
|---|---|---|---|---|---|
| TxD | 2 | OUT | 6 | ||
| RxD | 3 | IN | 5 | ||
| RTS | 4 | OUT | 8 | ||
| CTS | 5 | IN | 7 | ||
| DSR | 6 | IN | 1 | May be shorted with DCD | |
| GND | 7 | - | 4 | ||
| DCD | 8 | IN | 2 | May be skipped if shorted with DSR in DB-25 | |
| DTR | 20 | OUT | 3 |
Notes
Both connectors are DB-25 female; the cable is a null-modem crossover with TxD/RxD and the handshake lines (RTS/CTS, DTR/DSR/DCD) transposed between PC and device sides. DCD on the PC side (pin 8) may be omitted if DSR and DCD are shorted together at the DB-25 connector on the device side. RAD switch pin signal names are not publicly documented by the manufacturer.
Signals
- TxD — Transmit Data; PC sends serial data to the RAD device
- RxD — Receive Data; PC receives serial data from the RAD device
- RTS — Request To Send; PC asserts readiness to transmit
- CTS — Clear To Send; RAD device signals readiness to receive
- DSR — Data Set Ready; RAD device asserts active state; may be shorted with DCD on the device connector
- GND — Signal ground
- DCD — Data Carrier Detect; may be skipped if shorted with DSR in the DB-25 connector on the device side
- DTR — Data Terminal Ready; PC asserts readiness
References
- TIA/EIA-232-F — Interface Between Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange (Telecommunications Industry Association); DB-25 null-modem console wiring.