Despatch Protocol Manager with Protocol Plus - Manual (Page 48)

Protocol Manager Software E-100
44
Connecting Protocol Plus Controller(s)
to a Communications Host PC
Single Oven
If the oven purchased was not supplied with communication option, order Despatch RS-
232 communication kit P/N 161968. This kit contains all the parts required for one oven
to host PC via RS-232 including: Protocol Plus add-on communications board, oven
internal cabling, 25 foot null modem cable and Modbus protocol instruction manual.
For single oven communication, the Protocol Plus controller should be configured for
RS-
232 connection. Connect the host PC’s RS-232 COM port to the oven’s
communication port using a null-modem cable. Despatch P/N 161971 provides a 25
foot null-modem cable. Refer to Protocol Plus Manual for communication card jumper
and controller configuration settings.
Multiple Ovens
If the ovens purchased were not supplied with communication option, order Despatch
P/Ns 141820, add on Protocol Plus communication board, and 161950 (the internal
cabling) to make the ovens communication-ready including DB9 external cable
connections. Order Despatch P/N 161955 for the components required to network two
ovens to a host PC. This kit includes RS-232 to RS-422/RS-485 bi-directional adapter,
cabling, and Protocol-specific termination plugs.
Generically speaking, the following description details the steps necessary to network
multiple Protocol Plus controllers:
The host PC must have its assigned RS-232 COM port connected to a RS-422/RS-485
bi-
directional adapter, for example a “B&B Electronics” adapter Despatch P/N 161938-
40. These P/Ns provide the adapter, power supply and PC-to-adapter serial cable.
The following wiring description refers specifically to the B&B device, but may be
applied to acceptable substitute devices.
The Protocol Plus controller’s optional communication card should be configured for
RS-422A 4-wire connection. Set the dipswitches and jumpers on the adapter to match
the communication from the host PC RS-232 COM port to the adapter. Wiring from the
B&B adapter’s RS-422A RS-485 terminals is daisy-chained to each of the Protocol Plus
controllers. Connect the power supply pigtail leads from the adapter wall mount
transformer into the +12V and GND on the adapter. Plug the transformer into a
standard 120V / 60 Hz supply outlet.
It is important to note that the communication ready ovens are supplied with two DB9