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QUANTUM™ LX COMPRESSOR CONTROL PANEL
COMMUNICATIONS SETUP
090.020-CS (JUNE 11)
Page 54
MODBUS® NOTES
This has been an example of how the Quantum™
Controller uses the MODBUS® Protocol. It is hoped
that the information provided here will assist the end
user in writing applications that will allow the Quan-
tum™ to be implemented into networks that the cus-
tomer may already have in use.
This information is subject to change at any time, and
is provided as a reference only. Not all areas of the
MODBUS® Protocol can be handled in this document.
Some additional information regarding MODBUS®
Protocol that the end user should be aware of:
•
There are many versions of MODBUS® Protocol
that are available, and an application that works
properly on one system, may not function identi-
cally on another.
•
Some versions of MODBUS® Protocol may re-
quire the user to increment any referenced ad-
dresses by 1 (one). For instance, if you wanted
to look at Frick® Address 2003, you may need
to actually look at address 2004. The Quantum™
addressing begins at 0 (zero), whereas some
MODBUS® Protocols begin at 1 (one), therefore,
you may need to compensate.
•
7 or 8 bits selectable.
•
1 or 2 Stop bits selectable.
•
Parity can be set to None, Odd or Even
•
When using MODBUS® protocol (other than the
Hyperterminal example shown earlier), it is nec-
essary to use the MODBUS® Address column as
shown in the Quantum™ Data Tables. These ad-
dresses should work for most applications.
•
Follow the Frick® speci
fi
cations for data com-
munications requirements.
•
Hyperterminal can be used to test ASCII, but not
RTU or TCP/IP communications.
NOTE:
Be careful not to continuously request a set-
point change. It is to be expected that communica-
tions may slow down during the process of writing
setpoints or clearing alarms. Both of these processes
involve writing to either EEPROM or Flash Memory
and does take some time. If communication requests
are being sent faster than once every couple of sec-
onds, there will be temporary slowdowns during
these processes.
MODBUS® Data Access
Data passed to and from the Quantum™ are integer
values with one decimal
fi
eld assumed unless shown
otherwise or the command is sent to select two deci-
mal
fi
elds. For example, if the data’s value is 25.5 then
the value 255 is sent. All temperatures are in degree C
and all pressures are in PSIA unless the command is
sent to select the units of the panel. A mode such as
Slide Valve mode is sent as an integer value that rep-
resents the mode it is in. For example, a 0 is sent if it
is in manual, or a 10 is sent if it is in automatic, or a
20 is sent if it is in remote. The value zero (0) is used
to represent an OFF status and a DISABLED option.
The value one (1), which is received as a 10, is used
to represent an ON status and an ENABLED option.
Only data values that are designated as setpoints are
modi
fi
able. Read Only is used to help identify what
data is not modi
fi
able. The setpoint range is checked
to see if it is an allowed setting. If it is not allowed,
the setting is not changed. Reference the Quantum™
Data Tables in this manual for the address listing and
description of data.
A command has been provided that selects whether
data to and from the Quantum™ will be returned in
the units that are the default (pressure in PSIA and
temperature in Degree C) or in the units that are se-
lected to display at the panel.
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