Manual

DT220 Users Manual version 1.a Hardware & Wiring
38
Com Port 1 – J10 and TB6
The serial communication port 1 has a 9 pin ‘D’ connector at the back of the DT220.
NOTE: Com port 1 ground is NOT isolated from the DT220 circuit ground.
Com Port 1 ‘D’ Connector
Pin # Signal Name
1
2 RS232 RXD (receive data)
3 RS232 TXD (transmit data))
4
5 Ground (GND)
6 Current Loop Transmit
7 RS232 RTS (request to send)
8 RS232 CTS (clear to send)
9
Com Port 1 TB6
Pin # Signal Name
1 +5R (360 ohm to +5V)
2 Current Loop TX
3 CL receive R+ (360 ohm res)
4 CL receive +
5 CL receive -
6 +5V
7 GND (Function Lock)
Jump to TB3 –7 to unlock
Com Port 2 – J11 and TB6
The serial communication port 2 has a 9 pin ‘D’ connector at the back of the DT220.
NOTE: Com port 2 RS232 ground is isolated from the DT220 circuit ground.
Com Port 2 ‘D’ Connector
Pin # Signal Name
1
2 RS232 RXD (receive data)
3 RS232 TXD (transmit data))
4 +5R (360 ohm to +5V)
5 Ground (GND) (isolated)
6
7 +5R (360 ohm to +5V)
8
9