---
title: "Bi-directional RS-232/485 port"
canonical: "https://docs.cuesystem.com/space/PRODUCTS/297926658/Bi-directional%20RS-232%2F485%20port"
format: markdown
---
This bi-directional serial channel is used for RS-232 and RS-485 communication. 

The parameters are as follows:

- 3-pin 3.5 mm Phoenix type connector
- RS-232/485 modes
- Serial data baud rate 300 Bd ÷ 115 200 Bd (bps)
- Baud rate can be set to the following values: 300, 600, 1 200, 2 400, 4 800, 9 600, 19 200, 38 400, 57 600 and 115 200 Bd (bps).
- The default mode for the channel is RS-232, the RS-485 mode must be set in the programmed application.
- In RS-485 mode, this port supports connection of up to 31 devices/nodes when configured in a bus topology.

For more details see [CVC Help / Channels](https://cue.atlassian.net/wiki/spaces/CVCHELP/pages/518914091/Channels?atlOrigin=eyJpIjoiZDAzMDZkZmQzZjcxNDNmMmEzNTM4ODFkZWVlNGRkNTUiLCJwIjoiYyJ9) .

# RS-232 Mode

- Output signal levels -6 V to +6 V range.
- This is the default mode for all channels.

|  |  |  |  |  |
| --- | --- | --- | --- | --- |
| 3-pin 3.5 mm | Pin | Signal | Description | Direction |
| ![image](media://ce9210db-b2bc-4a04-acd2-113b1e7e9abd) | 1 | TxD | RS-232 Transmitted Data | From the unit |
| 2 | RxD | RS-232 Received Data | To the unit |
| 3 | GND | Ground |  |

#  RS-485 Mode

This mode must be set in the programmed application. In this mode, the port supports connection of up to 31 devices/nodes when configured in a bus topology.

|  |  |  |  |
| --- | --- | --- | --- |
| 3-pin 3.5 mm | Pin | Signal | Description |
| ![image](media://ce9210db-b2bc-4a04-acd2-113b1e7e9abd) | 1 | A+ | RS-485 Data + |
| 2 | B- | RS-485 Data - |
| 3 | GND | Ground |