MGate MB3660 Modbus Gateway
Web Console Configuration
4-13
Advanced Settings
The
Advanced Modbus
tab is where certain adjustments can be made to fine tune the communication
between different Modbus networks. You can configure
Initial Delay, Modbus TCP Exception, Modbus TCP
listen port,
and
Modbus TCP
Response Time-out.
Parameter
Value
Initial delay
0-30000 ms
Modbus TCP exception
Enable or Disable
Modbus TCP listen port
1-65535
Modbus TCP response timeout 10-120000 ms
Initial Delay
Some Modbus slaves may take more time to boot up than other devices. For certain environments, this may
cause the entire system to suffer from repeated exceptions during the initial boot-up. You can force the MGate
to wait after booting up before sending the first request with the
Initial Delay
setting.
Modbus TCP Exception
The MGate MB3660 is a protocol gateway that transparently passes requests and responses between the
Ethernet and serial interfaces. In some situations, it may be necessary for the gateway to return an exception
in response to a request from a Modbus TCP master. This is enabled or disabled with the
Modbus TCP
Exception
setting. When enabled, the unit can return two types of exception:
Exception
Conditions
Timeout
There is no response from the slave. Maybe the device is offline or the
serial cable is broken.
Request dropped
There are two situations that will result in this exception:
The request queue is full (32 request queue for each master)
The destination ID is not included in the slave ID map.
Not all Modbus TCP masters require this exception, so it is up to you to determine if this setting should be
enabled.
