Hello, I try to communicate with AirPrime HL8548 using Uart1 in slot IOT0. The purpose is to send AT requests. My first question: is that possible ? if yes, how. My interface for the Uart is 1.8 volts max I know my HL8548 works at 115200 bauds without flow control the swtich 6 on SW401 is On p…

[image] jftwit: I try to communicate with AirPrime HL8548 using Uart1 in slot IOT0.The purpose is to send AT requests.My first question: is that possible ? if yes, how. My interface for the Uart is 1.8 volts maxI know my HL8548 works at 115200 bauds without flow control the swtich 6 on SW401 i…

Thank for you reply. Yes, I use USB to Uart converter FTDI ref: TTL-232RG-VREG1v8-WE The postion of SW401-pin6 is set to default (OFF) although the “mangOH Green (DV4)user guide v1.pdf” says it has to be ON to get Uart1 directed to iot slots. OFF seems to be the correct configuration as the Tx s…

Hello, I find the solution: In “mangOH Green (DV4)user guide v1.pdf” it is written SW401-pin8 DCDC_shutdown turn ON => Disable secondary power supplies (1V8, 3V3 and 5V0), so only the primary CF3 module is powered. This is a big mistake SW401-pin8 DCDC_shutdown turn ON => Also disable primary p…

Thanks. We will fix this. Is it working for you now?

Did you ever get this working?? I am trying the same thing on a mangOH red with a WP8548 ( and an HL7748). I can send AT commands all day via tera term, but am wanting to send AT commands via an external MCU via UART1 on the IOT connector. (or any connector where this will work. I have tried the …

https://source.sierrawireless.com/resources/legato/howtos/customizeuart/ I think you need to set it to: at!mapuart=1,1 I havent tried this but let me know what you get. Also, Renfell is bringing an IoT card for UART to RS232 to the market shortly.

Ok. Thanks. I will try that…I will try anything! :slight_smile:

I did try this, but I think it configures like this at POR. If I run at!mapuart? I get !MAPUART:1,16. Which according to the specs means UART1 is mapped to service 1(AT) and UART2 is mapped to service 16 (which is linux console). So sending at!mapuart =1,1 makes uart1 mapped to service 1(AT). I …

@davidc Maybe you can contact Alex and discuss the UART-RS232 card you just designed. The issue with running long cabled on UART is that the drive strength is not there and may cause these kind of issues.

Thank you so much for your responses…very kind. We are going to get the lines on the scope tomorrow and see what is going on. If I figure this out I will share it.

Communication with HL8548 using Uart1

mangOH Green

Alex May 10, 2018, 7:39pm 14

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Communication with HL8548 using Uart1

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