Tech/Hardware/Serial
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Console Cable Pinout
Serial is a well established thing, but cables per vendor can get strange.
- A DB9 plug should be a Male for DTE and Female should be DCE.
- Vendors change things, ignore things and skip things, it is frustrating
- Servers and personal computers use mostly RS-232 but do not assume this.
DB9 to RJ45
- RS-232 Common Console Cables from DB9 Pin Female (DCE) to RJ45 Jacks
| Signal | Signal ABV | DB-9 | Cisco | Lantronix | Coolgear(w/null modem adpt) | Cyclades |
|---|---|---|---|---|---|---|
| Data Carrier Detect | DCD | 1 | - | 2 | 2 | 7 |
| Transmitted Data | TxD | 2 | 3 | 3 | 4 | 6 |
| Received Data | RxD | 3 | 6 | 6 | 5 | 3 |
| Data Set Ready | DSR | 4 | 7 | 7 | 6 | 2 |
| Ground | GND/G | 5 | 4/5 | 4/5 | 3 | 4 |
| Data Terminal Ready | DTR | 6 | 2 | 2 | 2 | 8 |
| Clear To Send | CTS | 7 | 8 | 8 | 8 | 1 |
| Request To Send | RTS | 8 | 7 | 1 | 1 | 5 |
| Ring Indicator | RI | 9 | - | - | - | - |
| Protective Ground | PG | - | - | - | - | - |
Notes:
- Coolgear USB-32COM-RM comes with DB9 Male cables
- Vendors have made products with configurable pinouts (rare)
RJ45 to RJ45
Popular on Cisco devices with RJ45 console ports. Cisco calls it a roll-over and you can see it is just a mirror or flip of the connector pins.
| Signal | Signal ABV | Cisco A | Cisco B |
|---|---|---|---|
| Data Carrier Detect | DCD | - | - |
| Transmitted Data | TxD | 6 | 3 |
| Received Data | RxD | 3 | 6 |
| Data Set Ready | DSR | 2 | 7 |
| Ground | GND/G | 5/4 | 4/5 |
| Data Terminal Ready | DTR | 7 | 2 |
| Clear To Send | CTS | 1 | 8 |
| Request To Send | RTS | 8 | 1 |
| Ring Indicator | RI | - | - |
| Protective Ground | PG | - | - |