ProSoft Technology MVI94-MCM-MHI User Manual
Page 96
Reference
MVI94-MCM ♦ Flex I/O Platform
User Manual
Serial Communications Modbus Communication Module
Page 96 of 109
ProSoft Technology, Inc.
March 29, 2011
[Section]/Item
Value
Range
Description
Float Flag:
Y or N
This flag specifies if the floating-point data access
functionality is to be implemented. If the float flag is set to Y,
Modbus functions 3, 6 and 16 will interpret floating point
values for registers as specified by the two following
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 if the Float Flag is enabled. For
example, if a value of 7000 is entered, all requests for
registers 7000 and above will be 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:
0 to 4
This is the Parity code to be used for the port. The coded
values are as follows: 0=None, 1=Odd, 2=Even, 3=Mark and
4=Space.
Data Bits:
5 to 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 to be used with
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 will be 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.
Minimum
Response Delay
0 to
65535
This parameter specifies the minimum number of
milliseconds to delay before responding to a request
message. This pre-send delay is applied before the RTS on
time. This may be required when communicating with slow
devices.
Use CTS Line:
Y or N
This parameter specifies if the CTS modem control line is to
be used. If the parameter is set to N, the CTS line will not be
monitored. If the parameter is set to Y, the CTS line will be
monitored and must be high before the module will send
data. This parameter is normally only required when half-
duplex modems are used for communication (2-wire).
[Modbus Master]
Configuration header for Modbus master.
Command Count:
0 to 100
This parameter specifies the number of commands to be
processed by the Modbus Master port.