MVI69E-MBS ♦ CompactLogix™ Platform
Configuring the MVI69E-MBS Using PCB
Modbus Serial Enhanced Communication Module
User Manual
ProSoft Technology, Inc.
Page 40 of 159
3.2.2 Modbus Port x Parameters
This section applies to both
MBS
P
ORT
1
and
MBS
P
ORT
2
.
In the ProSoft Configuration Builder tree view, double-click the
M
ODBUS
P
ORT X
icon.
Configuration Parameters Common to Master and Slave
Parameter
Value
Description
Start Active
Yes or No
Specifies whether or not the port and commands are active
upon module boot-up.
Type
Master, Slave,
or Slave with
Pass-Through
This parameter specifies which device type the port emulates.
See Slave Mode (page 72) for more information on Slave
Pass-Through options.
Protocol
RTU or ASCII
Specifies the Modbus protocol for the port.
Baud Rate
Multiple options Specifies the baud rate for the port.
Parity
None, Odd,
Even
Specifies the type of parity error checking. All devices on this
port must use the same parity setting.
Data Bits
7 or 8
Sets the number of data bits for each word used by the
protocol. All devices communicating through this port must use
the same number of data bits.
Stop Bits
1 or 2
Sets the number of stop bits that signal the end of a character
in the data stream. For most applications, use one stop bit. For
slower devices that require more time to re-synchronize, use
two stop bits. All devices communicating through this port must
use the same number of stop bits.
RTS On
0 to 65535
milliseconds
Sets the number of milliseconds to delay after
Ready To Send
(RTS) is asserted before data is transmitted.
RTS Off
0 to 65535
milliseconds
Sets the number of milliseconds to delay after the last byte of
data is sent before the RTS modem signal is set low.
Use CTS Line
Yes or No
Specifies if the Clear To Send (CTS) modem control line is to
be used or not. If you set the parameter to
N
O
, the CTS line is
not monitored. If you set the parameter to
Y
ES
, the CTS line is
monitored and must be high before the module sends data.
Normally, this parameter is required when half-duplex modems
are used for communication (2-wire). This procedure is
commonly referred to as
hardware handshaking
.
Float Flag
Yes or No
Specifies how the Slave driver responds to Function Code 3, 6,
and 16 commands (read and write Holding Registers) from a
remote Master when it is moving 32-bit floating-point data.
Note:
Most applications using floating-point data do not need
this parameter enabled.