# RV50 serial port configuration **URL:** \ **Category:** AirLink routers\ **Created:** [June 23, 2020, 9:46pm UTC](https://forum.sierrawireless.com/t/rv50-serial-port-configuration/20714 "2020-06-23T21:46:44Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![cgazoori](https://avatars.discourse-cdn.com/v4/letter/c/d07c76/32.png) [@cgazoori](https://forum.sierrawireless.com/u/cgazoori)\ **Post date:** [June 23, 2020, 9:46pm UTC](https://forum.sierrawireless.com/t/rv50-serial-port-configuration/20714/1 "2020-06-23T21:46:44Z")
How can I setup the RV50 serial port (or USB as serial) to communicate with an RS485 device. I have an RS485 to USB and an RS485 to RS232 converter, and can use either, but I am not sure how to configure the serial (or USB) port to stream commands between my PC and the serial device through the RV50. i connect to the RV50 remotely with a static ip address, and would like to set the serial port to pass through directly to the RS485 device. I’m not sure if I should be using the PAD device port, or setup on PPP. Any ideas would be much appreciated. Thanks! ---
**Author:** ![jerdung](https://avatars.discourse-cdn.com/v4/letter/j/82dd89/32.png) [@jerdung](https://forum.sierrawireless.com/u/jerdung)\ **Post date:** [June 24, 2020, 3:23am UTC](https://forum.sierrawireless.com/t/rv50-serial-port-configuration/20714/2 "2020-06-24T03:23:54Z")
Hi, I don’t know which protocol you need to control your device. If you set up a PPP connection, you can follow this ticket [AirLink RV50 - Linux integration](https://forum.sierrawireless.com/t/airlink-rv50-linux-integration/20596) Thanks, ---
**Author:** ![pek](https://avatars.discourse-cdn.com/v4/letter/p/df705f/32.png) [@pek](https://forum.sierrawireless.com/u/pek)\ **Post date:** [July 17, 2020, 2:03pm UTC](https://forum.sierrawireless.com/t/rv50-serial-port-configuration/20714/3 "2020-07-17T14:03:02Z")
The RV50 only supports the RS232 protocol on its serial port. I think I have had a couple customers who have used RS232-to-RS485 converters attached to their RV50’s, but since I didn’t help set those up, I cannot provide any further guidance. ---
**Author:** ![cgazoori](https://avatars.discourse-cdn.com/v4/letter/c/d07c76/32.png) [@cgazoori](https://forum.sierrawireless.com/u/cgazoori)\ **Post date:** [July 17, 2020, 2:40pm UTC](https://forum.sierrawireless.com/t/rv50-serial-port-configuration/20714/4 "2020-07-17T14:40:12Z")
Thank you. Yes, I am aware. I have an RS485 9-pin to USB, as well as an RS232 9-pin to RS485 9-pin adapter to overcome this. I know the USB port can also be configured as a serial port, I’m just unsure of how to configure the ports properly. Any additional suggestions welcome. I just want the RS-232 or USB port on the RV50 to pass through the modem on an IP call to act as if I am directly connected to the RS232 or USB port on my PC. Thanks again! ---
**Author:** ![pek](https://avatars.discourse-cdn.com/v4/letter/p/df705f/32.png) [@pek](https://forum.sierrawireless.com/u/pek)\ **Post date:** [July 20, 2020, 1:13pm UTC](https://forum.sierrawireless.com/t/rv50-serial-port-configuration/20714/5 "2020-07-20T13:13:52Z")
No, the USB port does not function like a traditional serial port. It can be used like a console port, but not the same as the physical DB9 serial port. This is quoted from the RV50 Hardware Manual: “USB Port can be configured to operate in one of two modes: · Virtual Ethernet Port: The RV50 Series gateway behaves as if the PC were connected to an Ethernet port, allowing access to the Internet and the gateway’s internal web server. This is the default setting. · Virtual Serial Port: The RV50 Series gateway behaves as if it was connected to a standard serial port. The primary use of this interface is for the AT command line interface of ALEOS and for diagnostic access to the radio module.” ---
**Author:** ![veer](https://avatars.discourse-cdn.com/v4/letter/v/5f9b8f/32.png) [@veer](https://forum.sierrawireless.com/u/veer)\ **Post date:** [May 2, 2021, 10:47pm UTC](https://forum.sierrawireless.com/t/rv50-serial-port-configuration/20714/6 "2021-05-02T22:47:06Z")
Hello. I’m trying to connect to the serial console using USB to RS232 cable ([https://www.amazon.com/gp/product/B00QUZY4UG/ref=ppx\_yo\_dt\_b\_asin\_title\_o00\_s00?ie=UTF8&psc=1](https://www.amazon.com/gp/product/B00QUZY4UG/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1)) Serial Configuration on RV50: ![2021-05-02_15-42-50](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/8/8521b33883359cc0bb2e8dc919f677a5572ad897.png) I have checked the baud rate and other settings but nothing seems to work other than the connected message. ![2021-05-02_15-45-21 (1)](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/4/4b7a8912d789b689219be76cbb0a19ede348ccde.jpeg) Any suggestions on how can I get this working. Thank you ---
**Author:** ![tlagrone](https://avatars.discourse-cdn.com/v4/letter/t/e47774/32.png) [@tlagrone](https://forum.sierrawireless.com/u/tlagrone)\ **Post date:** [January 7, 2022, 8:05pm UTC](https://forum.sierrawireless.com/t/rv50-serial-port-configuration/20714/7 "2022-01-07T20:05:35Z")
I was able to get the Serial Port working using the exact Configuration you had. My problem was limited to the fact that the format for Modbus RTU included the extra 6 routing bytes for Modbus TCP. Solved problem with an external ethernet to Modbus RTU converter from GridConnect and gave up on using the RV50X serial port. My configuration for testing included an RS232 to RS485 converters and a serial monitor tapping the RS485 bus to show bytes being sent. Everything was correct and functional except for format. One of my USB to Serial devices (Keyspan) did not work. FTDI based converter worked OK.