Rockwell Automation 2706-F11J_F11JC_F21J_F21JC DL50 INSTALLATION MANUAL - Manual (Page 39)

Chapter 4
Installing the DL50
4–14
The RS-485 interface has these advantages over the RS-232 :
•
Improved noise immunity.
•
DL50 displays can be a distance of up to 4000 feet (1200 m) from the
host device.
•
Up to 32 devices can be connected directly to the RS-485 port of the host
controller. Up to 100 DL50 displays can be addressed when line drivers
are used.
Figure 4.11 shows the location of the DL50’s RS-485 port terminals. The
terminals are labeled:
RS-485 Connection Terminals
Label Function Definition
1 E. GND Earth Ground
2 SHLD Shield
3 COM Common
4 + RS-485 + (B)
5 - RS-485 - (A)
6 TERM Termination
Figure 4.11
RS-485 Terminal Location
RESET
RESET
SHLD (Terminal #2)
COM (Terminal #3)
+ (Terminal #4)
- (Terminal #5)
TERM (Terminal #6)
E. GND (Terminal #1)
RS-485 Connections