Control Microsystems SCADAPack 32 - DTE to DTE with Handshaking; DTE to DCE with Handshaking; Figure 12: RS-232 DTE to RS-232 DTE Without Handshaking; Figure 13: RS-232 DTE to RS-232 DTE with Handshaking

RS-232 COM port (DTE) DTE
2
3
4
5
6
7
8
9
1
DCD
RxD
TxD
DT
R
GND
RT
S
CT
S
+5V
DCD
RxD
TxD
DTR
GND
RTS
CTS
See device
specification
s
for
p
in number
s
Figure 12: RS-232 DTE to RS-232 DTE without Handshaking
9.5.2 DTE to DTE with Handshaking
Some DTE devices may require hardware handshaking lines. The most common are the CTS and
RTS lines. Less common are the DTR and DCD lines. The controller does not require these lines.
Refer to the specifications of the external device for exact requirements. Figure 13: RS-232 DTE to
RS-232 DTE with Handshaking shows a common connection of an RS-232 COM port with a DTE
device requiring handshaking lines.
RS-232 COM port (DTE) DTE
2
3
4
5
6
7
8
9
1
DCD
RxD
TxD
DT
R
GND
RT
S
CT
S
+5V
DCD
RxD
TxD
DTR
GND
RTS
CTS
See d ev i c
e
specification
s
for
p
in number
s
Figure 13: RS-232 DTE to RS-232 DTE with Handshaking
9.5.3 DTE to DCE with Handshaking
DCE devices require different wiring. The handshaking lines must be connected in most cases. Note
that many DCE devices are half duplex. Select half-duplex operation with these devices. Figure 14:
RS-232 DTE to RS-232 DCE shows common connection of a SCADAPack with a DCE device
requiring handshaking lines.
SCADAPack 32 Controller Hardware Manual
May 24, 2006
30