Manual

DT220 Users Manual version 1.a Hardware & Wiring
39
Com Port 2 TB5
Pin # Signal Name
1 485 RX+
2 485 RX-
3 485 TX+
4 485 TX-
5 +5V (isolated)
6 GND (isolated)
7 GND (isolated)
Com Port 3 – J9 and TB4
The serial communication port 3 has a 9 pin ‘D’ connector at the back of the DT220.
NOTE: Com port 3 RS232 ground is isolated from the DT220 circuit ground.
Com Port 3 ‘D’ Connector
Pin # Signal Name
1
2 RS232 RXD (receive data)
3 RS232 TXD (transmit data)
4
5 Ground (GND)
6
7
8 RS232 CTS (clear to send)
9
Com Port 3 TB4
Pin # Signal Name
1 +5R (360 ohm to +5V)
2 Current Loop TX
3 CL receive R+
4 CL receive +
5 CL receive -
6 +5V
7 GND