Chapter 2 – Hardware Information23IoT Gateway System AIOT-QARS-422Pin Signal Pin Signal1 RS-422_TX- 2 RS-422_RX+3 RS-422_TX+ 4 RS-422_RX-5 Ground 6 NC7 NC 8 NC9 NCRS-485Pin Signal Pin Signal1 RS485_D- 2 RS485_D+3 NC 4 NC5 Ground 6 NC7 NC 8 NC9 NC2.4.14 Serial Port Box Header (COM2) (CN15)19DCDBXNCRXBXRTSBXTXBXCTSBXDTRBGNDNC