ProSoft Technology MVI71-MCM - Manual (Page 88)

MVI71-MCM ♦ PLC Platform Reference
Modbus Communication Module
Page 88 of 111 ProSoft Technology, Inc.
December 28, 2007
5.6.2 Port 1 Setup
Write
Block
Offset Internal
Database
Register Content Description
7 5010 Enable This parameter defines if this Modbus port will be used. If
the parameter is set to 0, the port is disabled. A value of 1
enables the port.
8 5011 Type This parameter specifies if the port will emulate a Modbus
master device (0), a Modbus slave device without pass-
through (1), or a Modbus slave device with unformatted
pass-through (2), or a Modbus slave device with formatted
pass-through and byte swapping (3).
9 5012 Float Flag This flag specifies if the floating-point data access
functionality is to be implemented. If the float flag is set to 1,
Modbus functions 3, 6, and 16 will interpret floating-point
values for registers as specified by the two following
parameters.
10 5013 Float Start 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.
11 5014 Float
Offset
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.
12 5015 Protocol This parameter specifies the Modbus protocol to be used on
the port. Valid protocols are: 0 = Modbus RTU and 1 =
Modbus ASCII.
13 5016 Baud Rate 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 entries are 110, 150, 300, 600, 1200, 2400,
4800, 9600, 19200, 28800, 384 (38400), 576 (57600), 115
(115200).
14 5017 Parity This is the parity code to be used for the port. Values are
None, Odd, Even.
15 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.
16 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.
17 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.
18 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.
19 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.