The BayTech RPC-3 (and RPC-3A) Remote Power Control unit exposes its management port as an 8-pin RJ-45 socket using the EIA-232 (TIA/EIA-232-F) serial interface standard. To connect a PC, Bay Technical Associates supplied a passive adapter — part number 9FRJ45PC-1 — that converts the modular RJ-45 plug to a DE-9 female connector compatible with a standard PC COM port. A separate crossed RJ-45 cable (model RJ08X007) is required between the RPC-3 device and the adapter. The adapter carries all eight EIA-232 signals: TxD, RxD, RTS, CTS, DTR, DSR, DCD, and GND.
8 pin RJ45 (8P8C) male connector to the Baytech RPC-3 EIA-232 connector
9 pin D-SUB female connector to the PC serial port
| Baytech RPC-3 EIA-232 connector Name | Baytech RPC-3 EIA-232 connector Pin | Direction | PC serial port Pin | PC serial port Name | Description |
|---|---|---|---|---|---|
| rpc-3 TX | 4 | → | 2 | pc RX | |
| rpc-3 RX | 5 | ← | 3 | pc TX | |
| rpc-3 RTS | 3 | → | 8 | pc CTS | |
| rpc-3 DTR | 1 | → | 6 | pc DSR | |
| GND | 2 | — | 5 | GND | |
| rpc-3 CD | 8 | ← | 1 | CP |
Notes
The RPC-3 control port is an 8-pin modular (RJ-45) socket; the DE-9 adapter (9FRJ45PC-1) is passive and terminates with a female DE-9 connector for the PC DTE side. A crossed RJ-45 patch cable (part no. RJ08X007) must be used between the RPC-3 port and the adapter — a straight-through patch cord will not work. A separate DB-25 adapter (part no. 25FRJ45PC-1) is also available for older PC serial ports. EIA-232 signal levels are ±3–15 V; maximum recommended cable run is approximately 15 m (50 ft) at standard baud rates up to 20 kbps.
Signals
- rpc-3 TX — transmit data from the RPC-3 to the terminal
- rpc-3 RX — receive data from the terminal to the RPC-3
- rpc-3 RTS — Request To Send from the RPC-3
- rpc-3 DTR — Data Terminal Ready from the RPC-3
- GND — signal ground
- rpc-3 CD — Carrier Detect (DCD) input to the RPC-3