PLX30 Series
MBTCP Protocol
Ethernet and Serial Gateways
User Manual
ProSoft Technology, Inc.
Page 103 of 200
September 19, 2012
Parameter
Value
Description
Enable
YES
NO
CONDITIONAL
Specifies if the command is to be executed and under what
conditions.
No (0)
- the command is disabled and will not be executed in
the normal polling sequence. However, the command can still
be activated using Command Control.
Yes (1)
- the command will be executed upon each scan of the
Command List if the Poll Interval is set to zero (0). If the
Poll
Interval
is set to a non-zero value, the command will be
executed when the interval timer for that command expires.
Conditional (2)
- the command will execute only if the internal
bit data associated with the command changes. It will also clear
the bit or bits in the internal database after the write command is
built. This parameter is valid only for bit-level write commands
(FC 5 and 15).
Internal
Address
0 to 3999
(for
register-level
addressing)
or
0 to 63999
(for
bit-level
addressing)
Specifies the database address in the gateway's internal
database to use as the destination for data brought in by a read
command, or as the source for data to be sent out by a write
command. The database address is interpreted as a bit address
or a 16-bit register (word) address, depending on the Modbus
Function Code used in the command.
For Modbus functions 1, 2, 5, and 15, this parameter is
interpreted as a bit-level address.
For Modbus functions 3, 4, 6, and 16, this parameter is
interpreted as a register-level address.
Poll Interval
0 to 65535
Specifies the minimum interval between executions of
continuous commands. The value is in tenths of a second.
Therefore, if a value of 100 is entered, the command will
execute no more frequently than once every 10 seconds.
Reg Count
1 to 125
(for
registers)
or
1 to 800
(for
coils)
This parameter specifies the number of 16-bit registers or binary
bits to be transferred by the command.
Modbus functions 5 and 6 ignore this field as they apply only to
a single data point.
For Modbus functions 1, 2, and 15, this parameter sets the
number of bits (inputs or coils) to be transferred by the
command.
For Modbus functions 3, 4, and 16, this parameter sets the
number of registers to be transferred by the command.
Swap Code
No Change
Word Swap
Word and Byte
Swap
Byte Swap
Specifies if and how the order of bytes in data received or sent
is to be rearranged. This option exists to allow for the fact that
different manufacturers store and transmit multi-byte data in
different combinations. This parameter is helpful when dealing
with floating-point or other multi-byte values, as there is no one
standard method of storing these data types. The parameter
can be set to rearrange the byte order of data received or sent
into an order more useful or convenient for other applications.
No change(0)
- No change is made in the byte ordering (1234 =
1234)
Word Swap (1)
-The words are swapped (1234=3412)
Word and Byte Swap (2)
- The words are swapped, then the
bytes in each word are swapped (1234=4321)
Byte Swap (3)
- The bytes in each word are swapped
(1234=2143)
These swap operations affect 4-byte (or 2-word) groups of data.
Therefore, data swapping using these
Swap Codes
should be
