DFRobot SIM7000E Shield - Serial Port Issue

[Stephen]

Hi Sheker,

This product is intended to be used as a shield connected to an Arduino. I can’t really speak to its behavior when interfaced with a FT232L USB to TTL Converter. Take a look at this thread and see if his solution might be related:

Issues in sending AT commands to SIM7000E

I just received the SIM7000E shield from DFRobot and connected it to an Arduino Uno. The Uno was also powered with a 12V plugpack. Otherwise, the shield could not be switched on. I uploaded the example code: DFRobot_SIM7000_ATtest. When “AT” was sent, it replied “OK”. But when other commands were sent like AT+CSQ or AT+CPIN?, it kept sending an error and the echoed command was also wrong. It replied correctly when “ATI” was sent and it was followed by “ERROR”. Screenshot below. [image] Does …