Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual - Manual (Page 70)

Choosing Communication
Chapter 5
5-12
Figure 5.10
Example DH+ to Data Highway to DH+ Link Configuration
17195
Data Highway
Remote DH+ link
1785ĆKA
PLCĆ5/10, Ć5/12, Ć5/15, Ć5/25
processor
Serial Connections
You can connect a programming terminal to a PLC-5/10, -5/12, -5/15, or
-5/25 processor through a serial port (COM1 or COM2) on the terminal
with one of the following communication modules:
1785-KE Series A or B Communication Interface Module
(resides in a 1771 I/O rack)
1770-KF2, Series B Communication Interface Module
(desktop unit as shown in Figure 5.12)
Important: The communication driver is interrupt-driven; the serial port
must support hardware interrupts. On most machines, COM1 and COM2
support these interrupts.