Operating instructions

Modifying the Configuration File PTQ-MCM ♦ Quantum / Unity Platform
Modbus Communication Module
ProSoft Technology, Inc. Page 69 of 139
April 29, 2008
Hold Offset
0 to 4999
This parameter specifies the offset address in the internal Modbus database that
is to be used with network requests for Modbus function 3, 6, or 16 commands.
For example, if a value of 50 is entered, a request for address 0 will correspond
to the register 50 in the database.
Command Count
0 to 100
This parameter specifies the number of commands to be processed by the
Modbus master port.
Min Cmd Delay
0 to 65535
This parameter specifies the number of milliseconds to wait between issuing
each command. This delay value is not applied to retries.
Cmd Err Pointer
-1 to 3995
This parameter sets the address in the internal Modbus database where the
command error will be placed. If the value is set to -1, the data will not be
transferred to the database. The valid range of values for this parameter is -1 to
4999. For example, if this parameter is configured for 1000, the command errors
will be copied to the database as follows:
1000: error code for command 0
1001: error code for command 1
etc.
An error code of 0 means that the command was successfully sent (no error).
Refer to Error Status Table for the command error code listings.
Response Timeout
Response Timeout : 0 #Response timeout for command (Master)
This parameter represents the message response timeout period in 1-millisecond
increments. This is the time that a port configured as a master will wait before
transmitting a command if no response is received from the addressed slave.
The value is set depending upon the communication network used and the
expected response time of the slowest device in the network.