speed

Connecting only tx, rx and gnd they work very well. (m90 schema)

HI EMIL Thank you for responding. MY MODEM HAS STANDARD AT COMMAND. IT'S WORK VERY WELL WITH M90 AND VISION PLC. I ASK YOU THE RANGE VOLTAGE OF JZ-PRG AND IF I CAN USE OUTSIDE POWER. THANKS

HI I'M TESTING A NEW GSM MODEM AND I saw that the JZ-PRG SERIAL DOES NOT WORK. THE MODEM IS HUAWEI GTM900. I USE A 6 WIRE STANDARD CABLE Properly CONNECTED HOW TO SCHEMA FOR SIEMENS MODEM AND CONNECT THE POWER OF JZPRG ON 1 AND 6-7 PIN OF MODEM. I noticed that THE VOLTAGE ON THE PIN IS 0,10V WITH SERIAL CONNECTED OR WITHOUT. I MADE THE COMPARISON WITH A MODEM WAVECOM AND I HAVE SEEN THAT WHEN I CONNECT THE MODEM WITH JZ-PRG THE voltage drops to 0.03 V. DO I HAVE CONNECT A RESISTANCE? IF IT'S YES WHAT'S IT TYPE. I DID ANOTHER TEST I GAVE VOLTAGE TO JZ-PRG OF WAVECOM AND I CONNECT THE GND AND TX RX OF HUAWEI. THE PLC DID THE INITIALIZATION AND IT WAS SENT AND RECEIVED SMS. SURELY it is a JZ-PRG power problem.