Serial
1*RS232 and 1*RS485 (or RS422) interface with built-in 15KV ESD protection
Data bits: 8 bits
Stop bits: 1 or 2 bits
Parity bits: none, even or odd
Indicator “Power”, “ACT”, "Online”
Antenna 1*Standard SMA female interface, 50 ohm, lighting protection(optional)
USIM 1*Standard sim card interface, support 1.8V/3V USIM card, 15KV ESD protection
Power 1*Terminal block interface, reverse-voltage and over-voltage protection