Rockwell Automation 2706-LV2P_LV2R_LV4P_LV4R DL40 PLUS USER MANUAL - Manual (Page 141)

Installation and Wiring 9–12
Publication 2706-6.1
When using a personal computer to upload or download application
memory to or from the DL40 Plus’s RS–485 port, use a Black Box
RS-485 converter, Model LD-485A-MP. The link from the personal
computer to the converter is an RS–232 link.
The following cable is recommended:
•
for an AT style computer, use an Allen–Bradley 2706-NC15.
•
for an XT style computer
Connect from the converter to the DL40 Plus as shown below.
Configure the converter as follows:
1. Remove cover and set the converter as a DCE device using the
XWlA jumper. This is a DIP shunt jumper.
2. Short TXA and RXA on TB1 of the converter. This should be
connected to J6, pin 5 of the DL40 Plus.
3. Short TXB and RXB on TB1 of the converter. This should be
connected to J6, pin 4 of the DL40 Plus.
4. Set switch W8 on the converter for full-duplex operation when
downloading or triggering messages via the RS–485 Port.
5. Set the RTS/CTS delay time to 5 milliseconds using jumper W9.
6. Set switch S2 to Unterminated position.
7. Replace cover.
8. Set Normal/Loopback switch on front cover to Normal.
RS-485 Port Black Box LD485A-MP Computer RS-232 Port
RS-485 RS-232
Shield
Signal
Ground
Term
CH-B
CH-A
Comm
Shield
E-Ground
Connecting a Programmer
to the RS-485 Port