BT401 Don't receive AT command set ACK values.

Hi All

I'm running the BT401 dev board with the SD Card and BT401 module.

I'm using an ESP32 device to communicate to the BT401 device via its AT command set. I also tried using the FEEASYCOM serial terminal program but cant get any response from the BT40 dev board.

I've verified I'm sending data to the device, but not receiving any acknowledge characters back.

I've tried all the board rates on the BT401 kit.

I'm running the BT401 board from 3V3, not 5V and have tried a pullup resister on the RX line of the BT401 which made no difference.
 

Thanks

Thomas