Despatch Protocol Manager with Protocol 3 and Protocol Plus - Manual (Page 56)

A PPENDICES Protocol Manager Instruction Manual
56 Version 1
Copyright © 2013 by Despatch Industries.
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simplified network wiring diagram). In this case, "To Host PC" actually indicates a cable
connection to the B&B adapter. The "PC Rcv" and "PC Xmit" terminals refer to the B&B
adapter's RD and TD terminals respectively. Install the 120 ohm resistor between the RD+ and
RD- terminals. Connect the GND wire to the 422/485 GND terminal. The remaining termination
resistor is applied at the RD+ and RD- terminals of the “last in line” networked oven.
RS-422/RS-485 allows communication over wires up to 1000 meters in length. Note that the
associated runs from the oven’s Protocol Plus controller to the breakout junction box should be
limited to 5 meters maximum. The junction boxes provide a drop from the network cable to each
oven. Terminate the cables marked “to Oven Controller” with 9-pin male subminiature “D” plug
for mating with the oven controller’s “Communication In” serial data receptacle.
Wire drop the cable according to Table 7.
Table 7. Networking Cable Terminal & Pin Numbers.
Oven signal Junction box terminal 9-pin plug pin number
Rcv+ 5 2
Rcv- 4 7
Xmit+ 1 3
Xmit- 2 4
GND 3 5
Figure 48. Junction Box Wiring.