# WP85 Maximum UART Baud Rates
**URL:** https://mangoh.discourse.group/t/wp85-maximum-uart-baud-rates/2893
**Category:** mangOH Red
**Created:** [September 4, 2019, 7:16pm UTC](https://mangoh.discourse.group/t/wp85-maximum-uart-baud-rates/2893 "2019-09-04T19:16:48Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@dbeckwith](https://mangoh.discourse.group/u/dbeckwith)
#### Post date: [September 4, 2019, 7:16pm UTC](https://mangoh.discourse.group/t/wp85-maximum-uart-baud-rates/2893/1 "2019-09-04T19:16:48Z")
What are the maximum UART baud rates for UART1 and UART2 on a WP85 module? The “Product Technical Specification” doesn’t talk about this at all.
Thanks
---
### Author:  [@mlw](https://mangoh.discourse.group/u/mlw)
#### Post date: [September 5, 2019, 6:26am UTC](https://mangoh.discourse.group/t/wp85-maximum-uart-baud-rates/2893/2 "2019-09-05T06:26:37Z")
Since it is firmware controlled if you send at+ipr to UART1 this will tell you the rate for the signalling firmware which handles the AT commands. For legato (so UART2 by default) you use the tty API and the baud rates are described here, looks like it goes to 4Mbps
[https://docs.legato.io/latest/le\_\_tty\_8h.html#a5ade4aa1b77c8cd69016695adca64f3c](https://docs.legato.io/latest/le__tty_8h.html#a5ade4aa1b77c8cd69016695adca64f3c)
Regards
Matt
---
### Author:  [@pinst](https://mangoh.discourse.group/u/pinst)
#### Post date: [September 5, 2019, 3:26pm UTC](https://mangoh.discourse.group/t/wp85-maximum-uart-baud-rates/2893/3 "2019-09-05T15:26:32Z")
I have tested /dev/ttyHS0 at 4Mbps. This is UART1 over the raspberry pi connector on mangOH Red. Module is WP7700 but this shouldn’t make a difference.
---
### Author:  [@dbeckwith](https://mangoh.discourse.group/u/dbeckwith)
#### Post date: [September 5, 2019, 3:37pm UTC](https://mangoh.discourse.group/t/wp85-maximum-uart-baud-rates/2893/4 "2019-09-05T15:37:02Z")
@mlw Thanks for the link.
---
### Author:  [@dbeckwith](https://mangoh.discourse.group/u/dbeckwith)
#### Post date: [September 5, 2019, 3:37pm UTC](https://mangoh.discourse.group/t/wp85-maximum-uart-baud-rates/2893/5 "2019-09-05T15:37:59Z")
@pinst Were you using flow control when you were testing UART1 at 4Mbps? I take it you haven’t tried this with UART2?
---
### Author:  [@pinst](https://mangoh.discourse.group/u/pinst)
#### Post date: [September 5, 2019, 4:22pm UTC](https://mangoh.discourse.group/t/wp85-maximum-uart-baud-rates/2893/6 "2019-09-05T16:22:12Z")
Not using RTS/CTS if that’s what you mean. As far as I know there is no direct external connection for UART2, it’s routed to uUSB1 or the WiFi chipset only.