64 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Chapter 4          Communication Connections
Figure 48 - DF1 Half-Duplex Master-Slave Protocol
DF1 Half-Duplex Network (Using PC and Modems)
SLC 5/03 
processor
MicroLogix 1400
MicroLogix 1400
MicroLogix 1400
CH0
CH0
CH0
CH0
1761-CBL-AP00 or 1761-CBL-PM02
(4)
1761-CBL-AM00 or 1761-CBL-HM02
(4)
DF1 master
DF1 Slave
DF1 slave
straight 9-25 pin cable
straight 
9-25 pin 
cable
radio modem 
or lease line
radio modem 
or lease line
RS-485 DF1 
half-duplex
DF1 Slave
1763-NC01 (daisychain) to AIC+
(4)
AIC+
1763-NC01 (daisy chain) to AIC+
(4)
RS-485 DF1 
half-duplex
24V DC power (user-supplied)
(1) DB-9 RS-232 port
(2) mini-DIN 8 RS-232 port
(3) RS-485 port
(4) Series C or later cables are required for Class I Div 2 applications.
TERM
A
B
COM
SHLD
CHS GND
TX
TX PWR
TX
DC SOURCE
  CABLE
EXTERNAL
TERM
A
B
COM
SHLD
CHS GND
TX
TX PWR
TX
DC SOURCE
  CABLE
EXTERNAL
TERM
A
B
COM
SHLD
CHS GND
TX
TX PWR
TX
DC SOURCE
  CABLE
EXTERNAL
RSLinx software version 2.0 (or higher), 
SLC 5/03, SLC 5/04, SLC 5/05, PLC-5®, or 
MicroLogix 1200 processors configured for DF1 
Half-Duplex master. 
RSLinx 2.5 required for MicroLogix 1400.
DF1 Half-Duplex protocol
MicroLogix 1500 with 1764-LSP 
or 1764-LRP Processor (slave)
SLC 5/03 (slave)MicroLogix 1000 
(slave)
MicroLogix 1500 with 
1764-LRP processor (slave)
MicroLogix 1400 
(slave)
Modem
MicroLogix 1200 
(slave)