FRICK
®
QUANTUM™ COMPRESSOR CONTROL PANEL S90-010 CS (APR 08)
COMMUNICATIONS SETUP Page 9
PROTOCOL DESCRIPTION
The use of communication protocols, permits data
transmission between devices. Protocol determines how
contact is established and how the query (question) and
response (answer) takes place. The information in a
message command requires an identity of the intended
receiver (ID #), what the receiver is to do (read or write to
a setpoint, etc.), data needed to perform an action (the
value of a setpoint to be changed), and a means of
checking for errors (checksum).
When using Com-2 for communication, check what
communication protocol, if any has been selected, from
the Panel Setup –
Change Communications
screen. For
example,
[A-B Comm]
should be selected when using
Allen-Bradley’s communication protocol. The baud rate of
Com-2 and the panel ID number are also changed from
this screen, and should coincide with the setup of the
other device.
Note:
The data communication protocols are continuously
being expanded and improved. Therefore, you should
consult Frick
®
Controls for the exact details on your
particular unit(s) before developing system software to
interface with the panel.
Quantum™ Communications Protocols
The Quantum™ controller has the capability of
communicating to the outside world through four software
protocols:
•
Frick
®
•
Allen-Bradley DF-1 serial
•
ModBus ASCII serial
•
YORK ISN
Note:
When using Modbus protocol, a
[Comm. 2
Advanced]
key will appear. Pressing this key will
allow the user to modify the number of Data and Stop
bits, as well as Parity. This only applies to Modbus.
Modbus cannot be changed from ASCII to RTU
however. Refer to the section on Modbus for further
information.
Checklist For Setting Up Communication
0191
Decide which Quantum™ protocol you
can communicate with and want to use.
0191
Setup your device’s communication port
for the Quantum™ protocol and select a baud
rate.
0191
Next, setup the Quantum™ for the desired
communication protocol. Select the protocol from
the Panel Setup –
Change Communications
screen. For example,
[A-B Comm]
should be
selected when using Allen-Bradley’s
communication protocol.
0191
Setup the baud rate of Com-2 to coincide
with the setup of the your device’s
communication port.
0191
Enter the Quantum™ ID. This will be used
to identify commands that are sent to it.
0191
Wire to the first panel via RS-232, RS-
422, or RS-485 connections to the Quantum™
Com-2 port.
•
If you are communicating to more than one
panel, then you will not be able to use RS-
232. You can however, convert RS-232 to
either RS-422 or RS-485 with an adapter
card. Reference the
Converting an RS-232
Serial Port to RS-422 or RS-485
section for
information about an adapter card.
Protocols
