ProSoft Technology MVI94-MCM-MHI - Manual (Page 21)

MVI94-MCM ♦ Flex I/O Platform Configuration
Serial Communications Modbus Communication Module User Manual
ProSoft Technology, Inc. Page 21 of 109
March 29, 2011
3.2 [Port]
The [PORT] section of the configuration file sets the Modbus port communication
parameters. The following table lists the parameters defined in this section.
[Section]/Item Value Range Description
[PORT] Configuration header for communication port.
Type: 0, 1, 3, 4 This parameter specifies if the port will emulate a
Modbus master device (0), a Modbus slave device
without pass-through (1), a Modbus slave device
with pass-through and data swapping (3), or a
Modbus slave device with pass-through (4).
Float Flag Yes or No This flag specifies if the floating point data access
functionality is to be implemented. If the float flag
is set to Yes, Modbus functions 3, 6, and 16 will
interpret floating point values for registers as
specified by the following two parameters.
Float Start 0 to 32767 This parameter defines the first register of floating
point data. All requests with register values
greater than or equal to this value will be
considered floating point data requests. This
parameter is only used in the Float Flag is
enabled. For example, if a value of 7000 is
entered, all requests for registers 7000 and above
are considered as floating point data.
Float Offset 0 to 3995 This parameter defines the start register for
floating point data in the internal database. This
parameter is only used if the Float Flag is enabled.
For example, if the Float Offset value is set to
3000 and the Float Start parameter is set to 7000,
data requests for register 7000 will use the internal
Modbus register 3000.
Protocol 0 or 1 This parameter specifies the Modbus protocol to
be used on the port. Valid protocols are 0 =
Modbus RTU and 1 = Modbus ASCII.
Baud Rate: 110 to 115K This is the baud rate to be used on the port. Enter
the baud rate as a value. For example, to select
19K baud, enter 19200. Valid entry for this field
include: 110, 150, 300, 600, 1200, 2400, 4800,
9600, 19200, 28800, 38400, 57600, and 115.
Parity: None, Odd, or
Even
This is the parity setting for the port.
Data Bits: 5 or 8 This parameter sets the number of data bits for
each word used by the protocol.
Stop Bits: 1 or 2 This parameter sets the number of stop bits for
each data value sent.
RTS On: 0 to 65535 This parameter sets the number of milliseconds to
delay after RTS is asserted before the data is
transmitted.
RTS Off: 0 to 65535 This parameter sets the number of milliseconds to
delay after the last byte of data is sent before the
RTS modem signal will be set low.