
8303
Varec, Inc.
71
5.9
Modbus Scanner (MSCAN)
The Modbus Scanner point provides communication between the 8303 TGI and
Modbus compatible slave devices represented by MG5000, MIREG, MFPREG, or any
other Modbus slave interface points. It includes parameters for configuring that
communication, and It provides dynamic and statistical information related to
connected devices. Two MSCAN points (one for each channel) are automatically
created when the motherboard detects the Model 8203.
5.9.1
Parameters
The database parameters used by the MSCAN point are listed and described below:
Configuration Parameters
Function
Chan
The physical channel (J2 or J4) used on the Model 8203. One MSCAN
point is created automatically for each channel by the system. The Chan
parameter is set in each MSCAN point and should not be changed.
For more information about the Model 8203 COM channels, see section
2.2.3 on page 10.
MaxRetry
Value between 1-10 indicating the number of times the scanner will
retry a request to a slave device. Default is 2.
Timeout
Time (in milliseconds) that a Device must respond to a request. Default
is 2000.
ScanDelay
Time in milliseconds for the delay between scans. The default is 500.
BaudRate
Baud Rate for communications to the slave device. Valid values are:
1200, 2400, 4800, 9600 and 19200.
LevelConvert
Determines the units in which the level data will be displayed.
F: Feet
M: Meters
Default is F.
TempConvert
Determines the units in which the temperature data will be displayed.
F: Fahrenheit
C: Celsius
If no value is specified, no conversion will be performed. The default is
F.
DensityConvert
Determines the units in which the density data will be displayed.
A: API
L: lbs/cu ft
K: kgs/m3.
If no value is specified, no conversion will be performed.
The default setting for this point is A.
Dynamic Parameters
Function
ScanCmd
Allows the user to Enable, Disable, or Reset Scanning.
ID
Address of slave device.
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