User manual

Connections 9
Doc: HMSI-168-92 Rev: 3.00Netbiter EasyConnect Gateway User Manual
2.2.2 RS-485 Serial Interface (3-pin Connector)
TheRS‐485serialinterfaceisusedtoconnectModbusRTUdevicestotheNetbiterEC220.
2.2.3 D-sub Connector
The9‐pinD‐subconnectorprovidesconnectivityforModbusRTUslaveunitsviaRS‐232
andforconnectingaGPSreceiver.
2.2.4 Antenna Connector
TheantennaconnectorisastandardSMAscrewconnector.Optionalexternalantennasare
availablefromyoursupplier.
Pin Function
A RS-485 A line
B RS-485 B line
COM RS-485 common
Pin Function
1 CD (Carrier Detect)
2 Rx (Receive)
3 Tx (Transmit)
4 DTR (Data Terminal Ready)
5GND
6 DSR (Data Set Ready)
7 RTS (Request To Send)
8 CTS (Clear To Send)
9 RI (Ring Indicator)
3-pin connector