Industry Cellular Gateway
to the Master. However, if the 0Bh exception box is checked (see below), a 0Bh
hex code based-error message will be send instead.
Value Range
:
0 ~ 5.
0Bh Exception
The box is unchecked
by default.
Check the
Enable
box to enable gateway to send a 0Bh exception code message
to Modbus Master to indicate that the slave device does not respond within the
timeout interval.
Tx Delay
The box is unchecked
by default.
Check the
Enable
box to activate to the minimum amount of time after receiving
a response before the next message can be sent out.
When Tx Delay is enabled the Gateway would insert a Tx delay between Master
requests. The delay gives sufficient time for the slave devices to turn their
transmitters off and their receivers back on.
Setup TCP/IP Connection for Receiving Modbus Master Request
The following Modbus TCP Configuration items allow user to set up the TCP connection settings so that the
remote Modbus Master can access to the Modbus gateway. Besides, it also allows user to specify authorized
masters on the TCP network.
Item
Value setting
Description
TCP Connection
Idle Time
1.
300
is set by default
2. Range 1 to 65535
Enter the idle timeout in seconds. If the gateway does not receive another TCP
request before the idle timeout elapsed, the TCP session will be terminated
automatically.
Value Range
:
1 ~ 65535.
Maximum TCP
Connections
1. 4 is set by default
2. Range 1 to 4
Enter the allowed maximum simultaneous TCP connections.
Value Range
:
1 ~ 4.
TCP Keep-alive
The box is unchecked
by default.
Check the
Enable
box to ensure to keep the TCP session connected.
Modbus Master IP
Access
Allow All
is selected by
default.
Specify authorized masters on the TCP network.
Select
Allow All
to allow any Modbus Master to reach the attached Slave(s).
Otherwise, limit only specific Master to reach the Slave(s) by selecting
Specific
IPs
.
When
Specific IPs
is selected, a Trusted IP Definition dialog will appear.
Specify Trusted Modbus Masters on the TCP network
When
Specific IPs
is selected, user has to specify the Master(s) by their IP addresses to reach the serially
attached Slave(s).
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