Rockwell Automation 1770-HT8 SMART TRANSMITTER - Manual (Page 53)

Installing the Smart Transmitter Interface
Products
Chapter 2
2-28
If you are using handshake signals with your computer, use the connection
shown in Figure 2.25 or Figure 2.26.
Figure 2.25
Connection to IBM Computer with Handshake Signals (25 pin)
1
TXD 2
RXD 3
RTS 4
CTS 5
GND 7
DSR 6
DCD 8
DTR 20
Computer
3 RXD
2 TXD
5 CTS
4 RTS
7 GND
20 DTR
6 DSR
8 DCD
Shield
90009
Communications Controller
Figure 2.26
Connection to IBM Computer with Handshake Signals (9 pin)
1
TXD 2
RXD 3
RTS 4
CTS 5
GND 7
DSR 6
DCD 8
DTR 20
Computer
2 RXD
3 TXD
8 CTS
7 RTS
5 GND
4 DTR
6 DSR
1 DCD
Shield
90010
Communications Controller