Digi TX54 User Manual page 622

Services
3. The new Modbus gateway server is enabled by default. Toggle off Enable the server to
disable.
4. For Connection type, select Socket or Serial. Available options in the gateway server
configuration vary depending on this setting.
If Socket is selected for Connection type:
n
a. For IP Protocol, select TCP or UDP. The default is TCP.
b. For Port, enter or select an appropriate port. The default is port 502.
If Serial is selected for Connection type:
n
a. For Serial port, select the appropriate serial port on the TX54 device.
5. For Packet mode, select RTU or RAW (if Connection type is set to Socket) or ASCII (if
Connection typeis set to Serial) for the type of packet that will be used by this connection.
The default is RTU.
6. For Packet idle gap, type the maximum allowable time between bytes in a packet.
Allowed values are between 10 milliseconds and one second, and take the format number
{ms|s}.
For example, to set Packet idle gap to 20 milliseconds, enter 20ms.
7. If Connection type is set to Socket, for Inactivity timeout, type the amount of time to wait
before disconnecting the socket when it has become inactive.
Allowed values are any number of minutes or seconds up to a maximum of 15 minutes, and
take the format number{m|s}.
For example, to set Inactivity timeout to ten minutes, enter 10m or 600s.
8. (Optional) If Connection type is set to Serial, click Half duplex to enable half duplex (two
wire) mode.
9. (Optional) If Connection type is set to Socket, click to expand Access control list:
To limit access to specified IPv4 addresses and networks:
n
a. Click IPv4 Addresses.
b. For Add Address, click .
c. For Address, enter the IPv4 address or network that can access the device's web
d. Click  again to list additional IP addresses or networks.
TX54 User Guide
administration service. Allowed values are:
A single IP address or host name.
l
A network designation in CIDR notation, for example, 192.168.1.0/24.
l
any: No limit to IPv4 addresses that can access the web administration service.
l
Modbus gateway
622