I’m using the UMTS & LTE V2.2 EVB board with EG-91 module for a specific application development. In my setup, an STM MCU is being connected to the EVB board via RS232 interface (MAX3232) with hardware flow control enable. The MCU does not give any TX call-back interrupt when ever I send command to the modem.
The EVB uses SN6053238 for RS232 coms. Are these two (MAX3232 and SN6503238) compatible to each other?
Note: Both systems are tested on PC so no problem at all with the STM UART code or the EVB coms. It’s just the connection between these two that’s not working at all.
Any help would me much appreciated. Thanks