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Serial Communication Set up Parameters
The GPD315 has parameters used for setting up serial communications. These communication
set up parameters are n151 through n155.
Parameter n151 - Modbus Time Out Detection
Parameter n151 is used to determine how the drive will respond to a time out error. A time out is
detected if the length of time between Modbus messages exceeds two seconds. The drive will
either fault, alarm, or not respond to a time out detection, depending upon how parameter n151
is set.
Table 3-3 below indicates how the drive will respond to a "time out" detection.
Parameter n151 Setting
The default setting of parameter n151 is '0'.
Parameter n152 - Modbus Frequency Reference Unit
Parameter n152 selects the frequency resolution of the frequency reference and the output
frequency monitor.
The output frequency resolution of the GPD315's digital operator is settable via n035, Frequency
Reference Unit Selection. If the digital operator resolution is set to 0.1 Hz (n035=0), and the
Modbus resolution is changed to 0.01 Hz in n152, the value in the hundredths digit of 0.01 Hz of
the received frequency reference is rounded off when displayed on the digital operator.
Table 3-4. Modbus Frequency Reference Unit Selection
Parameter n152 Setting
The default setting of parameter n152 is '0'.
Parameter n153 - Modbus Slave Address
Parameter n153 selects the drive's node or slave address. Each device on the same network
must be given a unique address. The setting range of parameter n153 is 0 to 31.
The default setting of parameter n153 is '0'.
GPD315 Modbus RTU Technical Manual TM 4325
Table 3-3. Modbus Time out Detection
0
1
2
3
4
0
1
2
3
Description
Coast to Stop (fault)
Ramp to Stop using n020 (fault)
Ramp to Stop using n022 (fault)
Continue Operation
Disabled
Frequency Reference Unit Selection
0.1 Hz
0.01 Hz
100% / 30,000
0.1%
6
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