700 Series Router Console Port Pinout (DB-9)
Connector DB9 FEMALE- 9 Pin
Connector DB9 MALE- 9 Pin
The Cisco 700-series routers (models 761, 762, 765, 766, 771, 772, 775, and 776) are late-1990s ISDN BRI access routers that provide a single DB-9 female (DB-9F) management console port labelled CONFIG on the rear panel; no auxiliary (AUX) port exists on any 700-series model. Unlike the DTE convention used on Cisco’s 1000/1600/2500/2600/3600 series, the 700-series console port is configured as DCE (Data Communications Equipment). The interface implements EIA/TIA-232 asynchronous serial signalling and does not support hardware flow control; default parameters are 9600 bps, 8 data bits, no parity, and 1 stop bit.
| Pin | Function |
|---|---|
| 1 | Output–Connects to the Carrier Detect (CD) input |
| 2 | Output–Connects to the Received Data (RXD) input |
| 3 | Input–Connects to the Transmitted Data (TXD) output |
| 4 | Input–Connects to the Data Terminal Ready (DTR) output |
| 5 | Signal Ground |
| 6 | Output–Connects to the Data Set Ready (DSR) input |
| 7 | Not used |
| 8 | Not used |
| 9 | Not used |
Signals
- CD — Carrier Detect output (from router to terminal); driven continuously by the router’s DCE port.
- RXD — Received Data; serial data output from the router (DCE Tx) to the connected terminal.
- TXD — Transmitted Data; serial data input to the router from the connected terminal.
- DTR — Data Terminal Ready; asserted by the connected terminal to signal readiness.
- GND — Signal Ground reference for the EIA/TIA-232 interface.
- DSR — Data Set Ready output from the router; asserted to indicate the router is ready.
- Pins 7, 8, 9 — Not used; no hardware flow control signals (RTS/CTS) are present.
Notes
- The console port is configured as DCE, which is the opposite of the DTE convention used on other Cisco IOS router families (1000, 1600, 2500, 2600, 3600 series).
- Connection requires a straight-through DB-9-to-DB-9 serial cable (blue); a DB-25-to-DB-9 adapter is available for older terminals. Do not use a rollover cable — rollover cabling applies only to the RJ-45 console ports found on other Cisco router families.
- No AUX port is present on any 700-series model (761, 762, 765, 766, 771, 772, 775, 776).
- Hardware flow control is not supported; configure the terminal emulator accordingly (no flow control).
- Default serial parameters: 9600 bps, 8 data bits, no parity, 1 stop bit.
- The 700 series are ISDN BRI access routers and should not be confused with the 7000-series backbone routers, which use a different console connector.