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Services
To limit access based on firewall zones:
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a. Click Zones.
b. For Add Zone, click .
c. For Zone, select the appropriate firewall zone from the dropdown.
d. Click again to allow access through additional firewall zones.
10. (Optional) Enable Send broadcast messages to configure the gateway to send broadcast
messages to this client.
11. For Response timeout, type the maximum time to wait for a response to a message.
Allowed values are between 1 millisecond and 700 milliseconds, and take the format
numberms.
For example, to set Response timeout to 100 milliseconds, enter 100ms. The default is 700ms.
12. Click to expand Modbus address filter.
This filter is used by the gateway to determine if a message should be forwarded to a
destination device. If the Modbus address in the message matches one or more of the filters,
the message is forwarded. If it does not match the filters, the message is not forwarded.
13. For Address or address range, type a Modbus address or range of addresses. Allowed values
are 1 through 255 or a hyphen-separated range.
For example, to have this client filter for incoming messages that contain the Modbus address
of 10, type 10. To filter for all messages with addresses in the range of 20 to 30, type 20-30.
To add additional address filters for this client, click .
14. For Fixed Modbus server address, if request messages handled by this client should always
be forwarded to a specific device, type the device's Modbus address. Leave at the default
setting of 0 to allow messages that match the Modbus address filter to be forwarded to
devices based on the Modbuss address in the message.
15. For Adjust Modbus server address, type a value to adjust the Modbus server address
downward by the specified value prior to delivering the message. Allowed values are 0 through
255. Leave at the default setting of 0 to not adjust the server address.
If a packet contains a Modbus server address above the amount entered here, the address will
be adjusted downward by this amount before the packet is delivered. This allows you to
configure clients on the gateway that will forward messages to remote devices with the same
Modbus address on different buses. For example, if there are two devices on two different
buses that have the same Modbus address of 10, you can create two clients on the gateway:
Client one:
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Modbus address filter set to 10.
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This will configure the gateway to deliver all messages that have the Modbus server
address of 10 to this device.
Digi Connect EZ Mini User Guide
See
Firewall configuration
for information about firewall zones.
Modbus gateway
320
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