---
title: "Bi-directional RS-232 port"
canonical: "https://docs.cuesystem.com/space/PRODUCTS/297893893/Bi-directional%20RS-232%20port"
format: markdown
---
This bi-directional serial channel is used for RS-232 communication. Output signal levels are in the -12 V to +12 V range. Baud rate can be set to the following values: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200 Bd (bps). In addition, smartCUE interfaces can use baud rates 230 400 and 460800 Bd (bps).

|  |  |  |  |  |
| --- | --- | --- | --- | --- |
| 5-pin 3.5 mm | Pin | Signal | Description | Direction |
| ![image](media://b8c8ce15-82ef-4620-b8f3-0678f065d2b9) | 1 | TxD | RS-232 Transmitted Data | From the unit |
| 2 | RTS | RS-232 Request to Send | From the unit |
| 3 | GND | Ground |  |
| 4 | RxD | RS-232 Received Data | To the unit |
| 5 | CTS | RS-232 Clear to Send | To the unit |