Rockwell Automation 1758-RTU202 DataSite Hardware User Manual User Manual
Page 38
Publication 1758-UM001D-EN-P - June 2011
38 Wiring the Controller
RS232 DTE to RS232 DTE with Handshaking
Some DTE (Data Terminal Equipment) require handshaking signal wires.
For details, refer to the relevant DTE manuals. The wires CTS, RTS, DTR and
DCD are used rarely.
The following figure shows a standard connection mode between RS232 port
and DTE with handshaking signal.
RS232 DTE to RS232 DCE with Handshaking
DCE (Data Communication Equipment) needs different signal wires, but
generally, DCE must be connected with the handshaking signal wire.
This figure shows a representative connection mode between RS232 port and
DCE with handshaking signal.
TIP
Most DCE use half-duplex communication. When using these
equipment, select half-duplex.
CTS
RTS
GND
DTR
TXD
RXD
DCD
RS232 (DTE)
DTE
1
2
3
4
5
6
7
8
9
CTS
RTS
GND
DTR
TXD
RXD
DCD
1
2
3
4
5
6
7
8
9
44697
CTS
RTS
GND
DTR
TXD
RXD
DCD
RS232 (DTE)
DCE
CTS
RTS
GND
DTR
TXD
RXD
DCD
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
44698