Advantech EKI-6333AC-4GP User Manual page 102

Item
Timeout Retries
0Bh Exception
Tx Delay
TCP Connection Idle
Time
Maximum TCP
Connections
TCP Keep-alive
Modbus Master IP
Access
Trusted IP Definition
EKI-6333AC-4GP User Manual
Description
If the slave does not respond to the Master's request, the gateway
will resend the request stored in the buffer. If timeout retries is set
to null (value zero), the gateway would not buffer Master requests.
If a value other than zero is specified, the gateway would store the
Master request in the buffer and retries to send the request in a
number of specified times.
Once the retries are exhausted, the gateway will send a Modbus
error message 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.
Check Enable checkbox 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.
Check Enable checkbox 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.
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.
Enter the allowed maximum simultaneous TCP connections.
Value Range: 1 ~ 4.
Check Enable checkbox to ensure to keep the TCP session
connected.
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, the
Trusted IP Definition function appears.
The function is only available when Modbus Master IP Access is
Specific IPs. Click Edit to fill in the IP definition settings.

Source IP:
–
Select Specific IP Address to only allow an IP address of
the allowed Master to access the attached Slave(s).
–
Select IP Range to only allow a set range of IP addresses
of the allowed Master to access the attached Slave(s).
–
Select IP Address-based Group to only allow pre-
defined group of IP address of the allowed Master to
access the attached Slave(s).

Enable: Check Enable checkbox to enable this rule.
Note:
Group must be pre-defined before this selection become
available. Refer to Object Definition > Grouping > Host
Grouping. You may also access to create a group by the
Add Rule shortcut button. Setting done through the Add
button will also appear in the Host Grouping screen. Then
check Enable checkbox to enable this rule.
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