# EM7565 Serial Ports AT Interface **URL:** \ **Category:** MC/EM Series\ **Created:** [December 21, 2017, 10:44pm UTC](https://forum.sierrawireless.com/t/em7565-serial-ports-at-interface/9708 "2017-12-21T22:44:31Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Sin10](https://avatars.discourse-cdn.com/v4/letter/s/71c47a/32.png) [@Sin10](https://forum.sierrawireless.com/u/Sin10)\ **Post date:** [December 21, 2017, 10:44pm UTC](https://forum.sierrawireless.com/t/em7565-serial-ports-at-interface/9708/1 "2017-12-21T22:44:31Z")
Hello, got my EM7565 today. I want to change the Modus to MBIM for my router. So i installed the drivers for WIN10, and i connect to the COM port and want to set up. So now i have the Problem: Windows shows me: COM3 =\> NMEA Port COM4 =\> WWAN Modem COM5 =\> DM Port So i can connect to all ports with PuTTy. But i can not send any AT commands to any interface. I tried so change the Speed for COM Ports, and set this in PuTTy, but i dont have any success. On my Router (turris omnia) i have the same Problem. I got ttyUSB0, ttyUSB1 and ttyUSB2 - i can connect to this, but i can not send any AT command. what is the problem? any ideas? ---
**Author:** ![zainol69](https://avatars.discourse-cdn.com/v4/letter/z/c77e96/32.png) [@zainol69](https://forum.sierrawireless.com/u/zainol69)\ **Post date:** [December 21, 2017, 11:21pm UTC](https://forum.sierrawireless.com/t/em7565-serial-ports-at-interface/9708/2 "2017-12-21T23:21:55Z")
Hello, I believe that module was working fine where on windows environment, putty should be working fine. You can install HyperTERM instead and could you check below syntaxes. ati atz at!entercmd=“A710” You can change MBIM or QMI by changed ATi!USBCOMP=1,1,100D or AT!USBCOMP=1,1,50D followed by AT!RESET Under Linux serial port is represented by ttyUSB2 ( i believe) where you can use minicom as example. ---
**Author:** ![Sin10](https://avatars.discourse-cdn.com/v4/letter/s/71c47a/32.png) [@Sin10](https://forum.sierrawireless.com/u/Sin10)\ **Post date:** [December 21, 2017, 11:43pm UTC](https://forum.sierrawireless.com/t/em7565-serial-ports-at-interface/9708/3 "2017-12-21T23:43:33Z")
hello, thanks for you answer. The problem is, i cannot write any letter in the terminal (windows and linux). I have a black screen, and i can not do anything. So i can not change the Mode to MBIM ---
**Author:** ![zainol69](https://avatars.discourse-cdn.com/v4/letter/z/c77e96/32.png) [@zainol69](https://forum.sierrawireless.com/u/zainol69)\ **Post date:** [December 22, 2017, 2:35am UTC](https://forum.sierrawireless.com/t/em7565-serial-ports-at-interface/9708/4 "2017-12-22T02:35:20Z")
hello, I see, you can try install Sierra QMI drivers manually by supply “USBCOMP=8”. I’ve looks like the same problem when I’ve installed latest Sierra QMI drivers on my EM7455 where ports were shown inside windows Device Manager and resolved by supply “USBCOMP=8” (believe for MBIM). I believe shall be applied for your module as well. ---
**Author:** ![Rose1812](https://avatars.discourse-cdn.com/v4/letter/r/5fc32e/32.png) [@Rose1812](https://forum.sierrawireless.com/u/Rose1812)\ **Post date:** [December 26, 2017, 2:56am UTC](https://forum.sierrawireless.com/t/em7565-serial-ports-at-interface/9708/5 "2017-12-26T02:56:43Z")
A parallel port is a type of interface found on computers (personal and otherwise) for connecting peripherals. The name refers to the way the data is sent; parallel ports send multiple bits of data at once, in parallel communication, as opposed to serial interfaces that send bits one at a time. ---
**Author:** ![Sin10](https://avatars.discourse-cdn.com/v4/letter/s/71c47a/32.png) [@Sin10](https://forum.sierrawireless.com/u/Sin10)\ **Post date:** [December 27, 2017, 9:17pm UTC](https://forum.sierrawireless.com/t/em7565-serial-ports-at-interface/9708/6 "2017-12-27T21:17:00Z")
ok now it is working. I have not do anything… only tried to connect again in, and it works now! thanks gyus! got another problem, but i will open another thread