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Slave ID option
In Modbus TCP the Slave ID is somewhat redundant as the destination of the message is already defined by the
IP address of the TCP packet. Modbus-capable Brainboxes devices can be configured to either respond to
Slave IDs 0 and 255, as required by the Modbus TCP specification, or to any valid Slave ID (0 to 247, and 255)
for convenience.
Accept All Addresses
The usual operation of Modbus is that if a Modbus master attempts to access a register, coil or input address
which is not used by the Modbus slave, the slave generates an error response and does not act on the request.
If the Accept All Addresses option is enabled, the ED device will instead treat all register, coil or input
addresses as valid: writes to unused addresses will be ignored, and reads from unused addresses will return
zeroes.
TCP Port
The TCP port is a 16 bit number, 1 – 65535, used to identify the services or processes being used in networking
communications. Specific port numbers are often used to identify specific services. By convention, TCP port
502 is used by the Modbus protocol.
Idle Timeout value
When the Idle Timeout is set to a non-zero, if there is no communication to the device for the specified period
of time (in seconds), the connection will be closed. The default idle connection is 0, meaning that connections
will not be closed on the basis of idle time. In compliance with the Modbus TCP standard, old connections may
still be closed if the maximum number of connections has been reached and a new connection is requested.
Max Connections
The Max Connections field allows the user to select the maximum amount of simultaneous connections which
can be made to their ED device at any one time. This field accepts any values between 1 (minimum) and 8
(maximum).
Data Format
There are two options available for the encoding of analogue values as integers in Modbus registers: as a value
in Volts or milliAmps multiplied by a power of 10, or scaled so that the range maximum maps to a round
hexadecimal value. See the Error! Reference source not found. section for more details.
Click on the 'Save' button when you have finished selecting the options you require.
Ethernet Analogue DIO
Product Manual V1.3
© Copyright Brainboxes Ltd
Page 45 of 100
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