Reference MVI56-MCM
♦
ControlLogix Platform
Modbus Communication Module
ProSoft Technology, Inc.
Page 113 of 159
July 24, 2008
Register Content
Description
5017 Parity This is the parity code to be used for the port.
Values are None, Odd, Even.
5018 Data
Bits This parameter sets the number of data bits for
each word used by the protocol. Valid entries for
this field are 5 through 8.
5019 Stop
Bits This parameter sets the number of stop bits to be
used with each data value sent. Valid entries are 1
and 2.
5020 RTS
On This parameter sets the number of milliseconds to
delay after RTS is asserted before the data will be
transmitted. Valid values are in the range of 0 to
65535 milliseconds.
5021 RTS
Off 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. Valid values are
in the range of 0 to 65535.
5022
Minimum Response
Time
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.
5023
Use CTS Line
This parameter specifies if the CTS modem control
line is to be used. If the parameter is set to 0, the
CTS line will not be monitored. If the parameter is
set to 1, 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).
5024 Slave
ID This parameter defines the virtual Modbus slave
address for the internal database. All requests
received by the port with this address are
processed by the module. Verify that each device
has a unique address on a network. Valid range for
this parameter is 1 to 255 (247 on some networks).
5025
Bit in Offset
This parameter specifies the offset address in the
internal Modbus database that is to be used with
network requests for Modbus Function 2
commands. For example, if the value is set to 150,
an address request of 0 will return the value at
register 150 in the database.
5026
Word in Offset
This parameter specifies the offset address in the
internal Modbus database that is to be used with
network request for Modbus function 4 commands.
For example, if the value is set to 150, an address
request of 0 will return the value at register 150 in
the database.
5027
Out in Offset
This parameter specifies the offset address in the
internal Modbus database that is to be used with
network requests for Modbus function 1,5, or 15
commands. For example, if the value is set to 100,
an address request of 0 will correspond to register
100 in the database.
