Rockwell Automation 2706 DL40 HARDWARE USER MANUAL - Manual (Page 131)

Chapter 11
Installation and Wiring
11 – 10
When a personal computer is used to upload or download application
memory to or from the DL40’s RS–485 port, a Black Box RS–485 converter,
Model LD-485A-MP should be used. 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-NC 15.
•
for an XT style computer, see Appendix C.
Connect from the converter to the DL40 as shown in Figure 11.10. The
converter should be configured 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.
3. Short TXB and RXB on TB1 of the converter. This should be connected
to J6, pin 4 of the DL40.
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.
Figure 11.10
Wiring the RS–485 Port when Port Use is Set to Programmer
RS-485 Port Set to
Programmer