# Not work UART with IoT slot#0 on mangOH green **URL:** \ **Category:** mangOH Green\ **Created:** [November 26, 2020, 4:53am UTC](https://mangoh.discourse.group/t/not-work-uart-with-iot-slot-0-on-mangoh-green/5725 "2020-11-26T04:53:00Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![takashishiina](https://avatars.discourse-cdn.com/v4/letter/t/a5b964/32.png) [@takashishiina](https://mangoh.discourse.group/u/takashishiina)\ **Post date:** [November 26, 2020, 4:53am UTC](https://mangoh.discourse.group/t/not-work-uart-with-iot-slot-0-on-mangoh-green/5725/1 "2020-11-26T04:53:00Z")
I bought RENFELL UART RS232-4W IoT card (0107-03-R2.1) and inserted it to IoT slot#0 on mangOH green. I confirmed that WP76 module can detect this card by “dmesg | tail –n 22” command. But UART#1 did not work on IoT slot#0. Please let us know the correct procedure to activate UART#1 on IoT slot#0. Note: When I inserted Ether IoT card, it is working fine. To confirm UART#1, I set AT!MAPUART=4,1 and am checking whether WP76 module can output NMEA message. Should I use Mux control? [https://github.com/mangOH/MuxControl](https://github.com/mangOH/MuxControl) ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [November 26, 2020, 5:44am UTC](https://mangoh.discourse.group/t/not-work-uart-with-iot-slot-0-on-mangoh-green/5725/2 "2020-11-26T05:44:25Z")
how about setting linux console to UART1? e.g. AT!MAPUART=16,1 AT!MAPUART=17,2 AT!RESET ---
**Author:** ![takashishiina](https://avatars.discourse-cdn.com/v4/letter/t/a5b964/32.png) [@takashishiina](https://mangoh.discourse.group/u/takashishiina)\ **Post date:** [November 26, 2020, 6:05am UTC](https://mangoh.discourse.group/t/not-work-uart-with-iot-slot-0-on-mangoh-green/5725/3 "2020-11-26T06:05:00Z")
My current setting is below. AT!MAPUART? !MAPUART: 4,17 OK But I did not see NMEA data with UART#1 on mangOH green IoT slot #0. I already set the below but UART#1 on IoT Slot #0 did not work. AT!MAPUART? !MAPUART: 16,17 OK ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [November 26, 2020, 6:06am UTC](https://mangoh.discourse.group/t/not-work-uart-with-iot-slot-0-on-mangoh-green/5725/4 "2020-11-26T06:06:20Z")
Did you disable flow control on host side? Did the iot board work on mangoh red board? ---
**Author:** ![takashishiina](https://avatars.discourse-cdn.com/v4/letter/t/a5b964/32.png) [@takashishiina](https://mangoh.discourse.group/u/takashishiina)\ **Post date:** [November 26, 2020, 10:05am UTC](https://mangoh.discourse.group/t/not-work-uart-with-iot-slot-0-on-mangoh-green/5725/5 "2020-11-26T10:05:32Z")
I bought the following IoT slot card. > **[0107-03-R2.1-U232-20161202.pdf](https://mangoh.io/uploaded-documents/Buy/IoT%20Cards/Renfell/0107-03-R2.1-U232-20161202.pdf)** > > 172.86 KB This doc is described as USB-serial. So, I understand that this IoT slot card do not work UART on WP76xx. To run this USB-serial IoT slot card, I think that I should to install driver for USB-Serial converter IC. Then, I need to rebuild the kernel. But my module latest FW is R13.3 now. I do not find the R13.3 Linux distribution. Do you know the R13.3 Linux distribution? ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [November 26, 2020, 11:08am UTC](https://mangoh.discourse.group/t/not-work-uart-with-iot-slot-0-on-mangoh-green/5725/6 "2020-11-26T11:08:11Z")
You can download here [https://source.sierrawireless.com/resources/airprime/software/wp76xx/wp76xx-firmware-release-13,-d-,1-components/#sthash.2vlTNVx1.dpbs%201](https://source.sierrawireless.com/resources/airprime/software/wp76xx/wp76xx-firmware-release-13,-d-,1-components/#sthash.2vlTNVx1.dpbs%201) ---
**Author:** ![takashishiina](https://avatars.discourse-cdn.com/v4/letter/t/a5b964/32.png) [@takashishiina](https://mangoh.discourse.group/u/takashishiina)\ **Post date:** [November 26, 2020, 12:36pm UTC](https://mangoh.discourse.group/t/not-work-uart-with-iot-slot-0-on-mangoh-green/5725/7 "2020-11-26T12:36:14Z")
Thanks. To rebuild the kernel for WP76 module, do you know good tutorial? I have leaf workspace. ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [November 26, 2020, 2:42pm UTC](https://mangoh.discourse.group/t/not-work-uart-with-iot-slot-0-on-mangoh-green/5725/8 "2020-11-26T14:42:11Z")
Just extract it amd type “make”