... Supports SMS, CSD, GPRS, UDP and TCP/IP protocols Supports Modbus RTU protocols GPRS Terminal IP Address The King Pigeon S2XX Serial ... -20mA and 0-5V, 12 bit resolution), RS485 Port(Support Modbus RTU Protocol, more protocols can be added according to application requirements ... GSM/GPRS Remote Controller equipped Siemens MC55i quad-band GSM Module inside to make it is industrial class reliability, is a ...