Specifications

CHAPTER 3
INSTALLATION
3-3
DT-203X, DT-105X and DT-110X display series
Protocols.”
All displays DT105/110/203/X may use RS232 and RS485 serial lines. Both use the
same connector located at the bottom of display.
The DT-105X, DT-110X and DT-203X displays use DB9 connector.
1
2
3
4
5
6
7
8
9
Rx
Tx
Dtr
GND
Dsr
A
B
RS-232
RS-485
DB9
Plug
1. RS-232/RS-485 connector
1
2
3
4
5
6
7
8
9
Rx
Tx
GND
A RX+
A TX+
B TX-
RS-232
RS-422
DB9
Plug
B RX-
2. RS-232/RS-422 connector
3.2.1. Diagram of the connection between a DT-105/110/203X display and PC
computer using RS-232.
Using an RS-232 serial line, the total length must not be longer than 5m.
It is important to use shielded cable and to connect the shield to pin 9 of the DB9
connector.
The transmission line must be placed away from high power lines. The connector
shown corresponds to the cable.
2
3
5
2
3
5
9
DB9
Socket
DB9
Socket
ComputerDisplay
3.2.2. RS-485 Connection diagram between 3 DT-105/110/203X displays , and PC.
Using an RS-485 serial line, the total length must not be longer than 1000m without
amplifiers.
Is important to use twisted and shielded cable and to connect the shield to pin 9 of the
DB9 connector.
The transmission line must be placed away from high power lines.
At both ends of transmission line there must be place a termination resistor of 120ohm.