# MangOH Red Board : WP v HL USB **URL:** \ **Category:** mangOH Red\ **Created:** [May 5, 2018, 2:27am UTC](https://mangoh.discourse.group/t/mangoh-red-board-wp-v-hl-usb/1387 "2018-05-05T02:27:22Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Alex](https://avatars.discourse-cdn.com/v4/letter/a/db5fbb/32.png) [@Alex](https://mangoh.discourse.group/u/Alex)\ **Post date:** [May 5, 2018, 2:27am UTC](https://mangoh.discourse.group/t/mangoh-red-board-wp-v-hl-usb/1387/1 "2018-05-05T02:27:22Z")
On my mangOH red board with a WP8548 installed, I can connect to it via tera term over USB to send AT commands, etc. I get a lot of virtual ports that show up. I can also send AT commands over the raspberry pi connector and access it that way. When I swap out the WP8548 for an HL77xx, I do not see any USB virtual ports and cannot connect to it via tera term. I can send it AT commands via RPi also, and get data back, but it is not behaving like the WP chip. I will be posting in the future, the difference in AT responses between the WP and HL chips. But my first question is: should I be able to connect to the HL chip via tera term and send it AT commands like the WP? When I swap out the modules, I make sure to invert pins 4 and 8 on the dipswitch. ---
**Author:** ![asyal](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/asyal/32/78_2.png) [@asyal](https://mangoh.discourse.group/u/asyal)\ **Post date:** [May 5, 2018, 3:13pm UTC](https://mangoh.discourse.group/t/mangoh-red-board-wp-v-hl-usb/1387/2 "2018-05-05T15:13:17Z")
Not through ssh over ecm but through AT port. Did you install the drivers for the HL module? ---
**Author:** ![Alex](https://avatars.discourse-cdn.com/v4/letter/a/db5fbb/32.png) [@Alex](https://mangoh.discourse.group/u/Alex)\ **Post date:** [May 5, 2018, 8:25pm UTC](https://mangoh.discourse.group/t/mangoh-red-board-wp-v-hl-usb/1387/3 "2018-05-05T20:25:00Z")
That is a great question. Is this the correct link? This is the only one I could find [https://source.sierrawireless.com/resources/airprime/software/hl854x-usb-drivers/](https://source.sierrawireless.com/resources/airprime/software/hl854x-usb-drivers/) But I am using the 7748. I tried to install the drivers, but seems I need a vendor certificate. ---
**Author:** ![asyal](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/asyal/32/78_2.png) [@asyal](https://mangoh.discourse.group/u/asyal)\ **Post date:** [May 5, 2018, 9:59pm UTC](https://mangoh.discourse.group/t/mangoh-red-board-wp-v-hl-usb/1387/4 "2018-05-05T21:59:10Z")
You should be able to downloaded them if you are signed into source If there is any issue, please let us know ---
**Author:** ![Alex](https://avatars.discourse-cdn.com/v4/letter/a/db5fbb/32.png) [@Alex](https://mangoh.discourse.group/u/Alex)\ **Post date:** [May 5, 2018, 11:31pm UTC](https://mangoh.discourse.group/t/mangoh-red-board-wp-v-hl-usb/1387/5 "2018-05-05T23:31:53Z")
I was able to download the drivers from that link. Driver installation def not as easy as it was for the WP chips, so I will have to look into it and read the docs. ---
**Author:** ![Alex](https://avatars.discourse-cdn.com/v4/letter/a/db5fbb/32.png) [@Alex](https://mangoh.discourse.group/u/Alex)\ **Post date:** [May 6, 2018, 2:04am UTC](https://mangoh.discourse.group/t/mangoh-red-board-wp-v-hl-usb/1387/6 "2018-05-06T02:04:25Z")
I am not even going to bother trying to install the HL driver for now: I can read the data it sends back to me via my microcontroller. I have code that is able to send an SMS message with the WP8548, but when I swap it out for the HL7748, I get a +CMS 500 error after I send it the command to send the message. Here is what I do" send AT+CMGF =1(Enables SMS messaging), get OK back send AT+CSMP = 17,169,0,0, get OK back send AT+CMGS = “+1xxxxxxxxxx”, get “\>” back send the actual message ending with a “ctrl-z”, get the CMS+500 error. The CMS+500 could mean anything. I will dig a little bit more into it, but I will probably switch back to the WP to continue development. I thought I could just swap out the chips if I had stuff working on the WP.