B&B Electronics MESR321_SL_ML - Manual - Manual (Page 33)

Setup and Connections Vlinx MESR321 Modbus Gateway
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MESR321-xx_R001_2113m
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b. Attached – This is selectable between Master and Slaves. If Master is
selected, the Modbus Gateway will run in TCP server mode, if Slaves is
selected, it will run in TCP client mode.
c. Modbus – indicates the protocol of the device connected to the port. It can
be either RTU or ASCII.
d. Modbus Broadcast
– Check this box to send Modbus broadcasts to a
specific serial port. Modbus broadcast is Slave ID 0h. If selected the
Gateway will send broadcast messages out the serial port and will not
expect a response. If unselected it will use slave ID 0h as a standard
address.
e. Enable 0Bh Exception – Check this box to enable. When the Modbus
slave device does not respond before the timeout has been reached or
has a bad response (check sum does not match), the 0Bh exception code
is transmitted to the Master that initiated the Modbus message.
f. Enable Serial Message Buffering
– If this option is selected, the gateway
will buffer up to 32 messages request per port. If this option is unselected,
the gateway will respond with a 06h if it has a message out on the port
with no response yet.
g. Modbus Serial Retires – Select 0 through 5. This sets the maximum
number of times that the Modbus gateway will retry to send a Modbus
message to a Modbus client, before reporting a 0Bh exception if it is
selected. Number of retries is limited to 5.
h. Milliseconds Modbus Message Timeout
– This is the maximum amount of
time to wait for a response to the message. Valid value range is from 1 to
65535.
i. Milliseconds TX Delay
– This is the minimum amount of time after
receiving a response before the next message can be sent out. Valid
value range is from 1 to 65535.
j. Save settings by clicking the “Save” button.
12. Port 1 ID Remap
a. To access this screen, click the “Next” button or click the “Port 1 ID
Remap” link on the left side of the screen.
b. This screen allows you to set Modbus Slave ID Remap settings.