Communications settings
The communications settings used for serial data and signaling.
Properties
Baud
The serial baud rate for this port.
The baud rate determines the speed of the serial port. It is expressed in bits-per-second (bps). Communicating devices must be set to the same baud rate. The higher the baud rate the faster the connection. 9600 or 115200 are commonly used settings.
| Option | Label |
|---|---|
50 | 50 |
75 | 75 |
110 | 110 |
134 | 134 |
150 | 150 |
200 | 200 |
300 | 300 |
600 | 600 |
1200 | 1200 |
1800 | 1800 |
2400 | 2400 |
4800 | 4800 |
9600 | 9600 |
19200 | 19200 |
38400 | 38400 |
57600 | 57600 |
115200 | 115200 |
- Data type: string select
- Default:
9600 - Configuration
- Required
CLI: (cli)> config serial <key> comms baud
Data bits
The number of data bits in each character transmitted or received.
8 data bits is by far the most common setting, only choose 7 data bits if it is required by the connected device.
| Option | Label |
|---|---|
7 | 7 |
8 | 8 |
- Data type: string select
- Default:
8 - Configuration
- Required
CLI: (cli)> config serial <key> comms data-bits
Stop bits
The number of bits signifying the end of data.
1 stop bit is most commonly used with 8 data bits, other options should only be chosen when the communicating equipment is known to required specific settings.
| Option | Label |
|---|---|
1 | 1 |
2 | 2 |
1.5 | 1.5 |
- Data type: string select
- Default:
1 - Configuration
- Required
CLI: (cli)> config serial <key> comms stop-bits
Parity
Parity checking is used to detect errors in the communication.
No parity checking is commonly used, only on specific use cases will another parity setting be required.
| Option | Label | Description |
|---|---|---|
none | None | |
even | Even | Even parity checking bits. The number of bits in each each transmission, including the parity bit, is even. |
odd | Odd | Odd parity checking bits. The number of bits in each each transmission, including the parity bit, is odd. |
- Data type: string select
- Default:
none - Configuration
- Required
CLI: (cli)> config serial <key> comms parity
Flow control
Flow control is used to pause communications when required.
No flow control is often used for low bandwidth interactive connections. A suitable flow control option should be chosen for higher throughput communications or when it is desirable to tell the peer to pause transmission to prevent overflows while the currently received data is processed.
| Option | Label | Description |
|---|---|---|
none | None | No flow control. It is not possible to inform the peer that transmission should be paused, if either device is unable to receive incoming data it will be lost. |
rts-cts | RTS/CTS | RTS and CTS are used to set/check flow control status. RTS is asserted when it is ready for the peer to transmit, data is only transmitted to the peer when CTS asserted. |
dtr-dsr | DTR/DSR | DTR and DSR are used to set/check flow control status. DTR is asserted when it is ready for the peer to transmit, data is only transmitted to the peer when DSR asserted. |
sw | Software (XON/XOFF) | In-band data characters are used to stop/start communications. IXOFF (^S) is transmitted to request the peer to pause sending, an IXOFF (^Q) is transmitted when it is ready for the peer to resume communications. |
- Data type: string select
- Default:
none - Configuration
- Required
CLI: (cli)> config serial <key> comms flow-control
Pinout
Select the Pinout of the serial connector.
This port has the ability to change the pinout it uses to help with communications to different devices.
| Option | Label | Description |
|---|---|---|
straight | Straight | Cisco straight pinout. |
| RJ45 Female Pin | Signal | |
| --------------- | ------ | |
| 1 | CTS | |
| 2 | DSR | |
| 3 | RXD | |
| 4 | GND | |
| 5 | Not Connected | |
| 6 | TXD | |
| 7 | DTR | |
| 8 | RTS | |
rolled | Rolled | Avocent/Cyclades pinout. |
| RJ45 Female Pin | Signal | |
| --------------- | ------ | |
| 1 | RTS | |
| 2 | DTR | |
| 3 | TXD | |
| 4 | GND | |
| 5 | CTS | |
| 6 | RXD | |
| 7 | DCD | |
| 8 | DSR | |
- Data type: string select
- Default:
straight - Configuration
- Required
CLI: (cli)> config serial <key> comms pinout