Digi TX54, User Manual

Page: 622 / 1087

Services Modbus gateway
TX54 User Guide 622
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.
n
If Socket is selected for Connection type :
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 .
n
If Serial is selected for Connection type :
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 type is 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 :
n
To limit access to specified IPv4 addresses and networks:
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
administration service. Allowed values are:
l
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.
d. Click

again to list additional IP addresses or networks.