---
title: "RS-232 Serial Expansion Module with 1x DB9 Connector"
url: "https://cradlepoint.ericsson.com/products/accessories/rs-232-serial-expansion-module-with-1x-db9-connector/"
description: "RS-232 Serial Expansion Module with 1x DB9 Connector — Part # MC20-SRL"
content_type: "pim_accessory"
part_no: "MC20-SRL"
product_status: "Active"
accessory_family: "Expansion Modules"
expansion_subtype:
  - "RS-232 Serial"
regions:
  - "North America"
breadcrumb: "[Home](https://cradlepoint.ericsson.com/) › Products › [Accessories](https://cradlepoint.ericsson.com/products/accessories/) › RS-232 Serial Expansion Module with 1x DB9 Connector"
gated: false
---

# RS-232 Serial Expansion Module with 1x DB9 Connector

Part #: MC20-SRL

![RS-232 Serial Expansion Module with 1x DB9 Connector](https://images.contentstack.io/v3/assets/blt2588e757607604a2/bltcc81f8b17e4f8b48/69fce846613c6878042c6db4/url_MC20-SRL-serialModule_600x320.png)

## Product description

Expansion module that adds serial RS-232 connectivity to S400 and S450 router

## What's included

Expansion module

## Resources

[S400 quick start guide ](https://resources.cradlepoint.com/s400/ericsson-cradlepoint-s400-s450-quick-start-guide)

## Compatible hardware

### Endpoints

- [S400](https://cradlepoint.ericsson.com/products/endpoints/s400/)