Rockwell Automation 2706-F11J_F11JC_F21J_F21JC DL50 INSTALLATION MANUAL - Manual (Page 49)

Chapter 4
Installing the DL50
4–24
The ASCII I/O Module (Catalog No. 1771-DA) provides a serial interface
for almost all Allen-Bradley programmable controllers. It can be plugged
into any slot of a standard 1771 local or remote I/O rack.
The ASCII I/O Module has no memory or programming language. All DL50
display messages would be stored in the programmable controller’s memory.
Figure 4.20 shows how to connect the RS-232 port of the DL50 to a ASCII
I/O Module.
Note: Using an RS-232
¹RS-485 converter such as the Black Boxt
LD-485A-MP you can connect the ASCII I/O Module and the RS-485 port
of one or more DL50(s). See figure below.
Figure 4.20
RS-232 Connection to an ASCII I/O Module
DL50
RS-232 TERMINALS
T
R
1
G
1
2
3
4
5
6
DL50
RS-485
TERMINALS
2
3
2
3
4
5
6
20
Chassis / Shield
TxD Output
RxD Input
Signal Ground
7
1771-DA
RS-232 PORT
TxD Output
RxD Input
Signal Ground
Shield
2
3
4
5
6
20
7
RxB
RxA
TxB
TxA
E. GND
SHLD
COM
+
–
TERM
BLACK BOX
LD-485A-MP
Consult Black Box instruction sheet
for wiring connections. Connections
depend upon converter setup.
1771-DA
RS-232 PORT
Chassis / Shield
Note: Connect shield to ground
at one node only
Shield
ASCII I/O Module
Catalog No. 1771-DA