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PLX3x Series ♦ Multi-Protocol Gateways MBS Protocol
User Manual
ProSoft Technology, Inc. Page 121 of 215
January 25, 2018
Configuration Parameters Common to Master and Slave
Parameter Value Description
Enabled Yes or No Specifies if the port will be used.
N
O
- The gateway does not use the port.
Y
ES
- The gateway uses the port.
RS Interface RS-232
RS-485
RS-422
Specifies the electrical interface for the ports.
Type Master
or
Slave Specifies if the port emulates a master or slave device.
M
ASTER
- The gateway initiates Modbus commands to one or more Modbus
devices
S
LAVE
- The gateway responds to Modbus commands initiated by a Modbus
master
Float Flag
(Enron-
Daniels) Yes or No This parameter only appears if Float Flag is Yes.
Specifies if the gateway implements floating-point data access. If the float flag
is set to Yes, Modbus functions 3, 6, and 16 interpret floating-point values for
registers as specified by the two following parameters (
Float Start and Float
Offset ).
Float Start 0 to 32767 This parameter only appears if Float Flag is Yes.
Specifies the first register of floating-point data. All requests with register
values greater than or equal to this value are considered floating-point data
requests. For example, if you enter a value of 7000, the gateway considers all
requests for registers 7000 and above will as floating-point data.
Float Offset 0 to 3998
This parameter only appears if Float Flag is Yes.
Specifies the start register for floating-point data in the internal database. For
example, if you enter a value of 3000 and set the
Float Start parameter to
7000, data requests for register 7000 use the internal Modbus register 3000.
Protocol RTU or
ASCII Specifies the Modbus protocol version for the port.
Baud Rate Various Specifies the baud rate for the port.
Parity None
Odd
Even Specifies the type of parity checking to use. Parity is a simple error checking
algorithm used in serial communication. All devices communicating through
this port must use the same parity setting.
Data Bits 7 or 8 Specifies the number of data bits for each word for the protocol.
All devices on this port must use the same number of data bits.
Stop Bits 1 or 2 Specifies 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 on this port must use the same number of stop bits.
RTS On 0 to 65535
Specifies the number of milliseconds to delay data transmission after Ready
To Send (RTS) is asserted.
RTS Off 0 to 65535 Specifies 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 used or not.
N
O
- The gateway does not monitors the CTS line.
Y
ES
- The gateway monitors the CTS line and it must be high before the
gateway 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 .