Please note, if your NAT (router) includes a built-in a firewall
feature, you have to
configure
the NAT to allow incoming TCP port
connections.
For e x a m ple :
TCP por t in clu de s 5 0 2 a n d 5 1 2 of N AT.
In the SCADA/HMI (Modbus/TCP client) program, you have to access
tGW-700 by using
NAT’s address and NAT’s TCP ports instead
of tGW-700’s settings.
For e x a m ple :
Th e fir st t GW - 7 0 0 , it ’s I P: Por t sh ou ld be N AT: 5 0 2 .
Th e se con d t GW - 7 0 0 , it ’s I P: Por t sh ou ld be N AT: 5 1 2 .
3. Why does t he t GW- 700 ser ies m odule fail on a ( public) I nt er net
connect ion?
The default IP address of the tGW-700 series module is 192.168.255.1, which can be only
used on a private Internet connection. A private network packet will not be routed via a
(public) Internet connection, which is the reason why the tGW-700 series module fails on the
Internet.
Th e I AN A h a s r e se r v e d t h r e e a ddr e ss spa ce s for pr iv a t e in t e r n e t s ( RFC1 9 1 8 ) .
1 0 .0 .0 .0 - 1 0 .2 5 5 .2 5 5 .2 5 5 ( 1 0 / 8 pr e fix )
1 7 2 .1 6 .0 .0 - 1 7 2 .3 1 .2 5 5 .2 5 5 ( 1 7 2 .1 6 / 1 2 pr e fix )
1 9 2 .1 6 8 .0 .0 - 1 9 2 .1 6 8 .2 5 5 .2 5 5 ( 1 9 2 .1 6 8 / 1 6 p r e fix )
t GW - 7 0 0 Se r ie s Use r M a n u a l, V e r sion 1 .6 , Ju l. 2 0 1 1
59
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