2.
Select Modbus TCP mode.
Device Mode
The device is set as subordinate, which means that the device operates as a Modbus
server processing the request from the client.
Register Mode
In Read Only, the client can only read all the register data. In Read/Write, the client can
read while
congure the device using the Modbus TCP protocol.
3.
Check Enable Authorized IP Addresses and click Add to add IP addresses that are
allowed to access to the device.
Note
With regard to the network security risk, it is recommended to limit permission only to
trusted IP addresses.
3.14.3 Modbus Error Code Description
If communication of Modbus is abnormal, an error code will be returned. Please refer to
the following table to check the meaning of the error code to help troubleshoot Modbus
communication problems.
Table 3-1 Modbus Error Code Description
Error
Code
Name Description
01 Illegal Function The function code received in the query is not an
allowable action for the server. This may be
because the function code is only applicable to
newer devices, and was not implemented in the
unit selected. It could also indicate that the server
is in the wrong state to process a request of this
type, for example because it is
uncongured and is
being asked to return register values.
02 Illegal Data Address The data address received in the query is not an
allowable address for the server. More
specically,
the combination of reference number and transfer
length is invalid. For a controller with 100 registers,
the PDU addresses the rst register as 0, and the
last one as 99. If a request is submitted with a
starting register address of 96 and a quantity of
registers of 4, then this request will successfully
operate (address-wise at least) on registers 96, 97,
Thermal & Optical Bi-spectrum Network Camera User Manual
17
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