NJR-CTB Command Guide
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3.1.4 Limit on the number of TCP-IP connections and port overload management
The NJR-CTB
’s maintenance port supports a maximum of eight simultaneous connections (eight logical
ports). To maintain optimal system accessibility, it is advisable to issue
“port-open” and “port-close”
commands before and after command or query strings are issured. This approach enables eight or more
control devices to be effectively interfaced simultaneously and without concern for communication errors. As a
safeguard, the NJR-CTB incorporates a 30-second timeout window for each port. If any port is inactive for
more than 30 seconds, it will be closed automatically.
[Table 3.2] Increasing connections
Your PC software
NJR-CTB
Connecting TCP-IP
→
(Occupying 1 port)
Sending command (@xxx)
→
←
Replying command (@xxx)
Closing TCP-IP
→
(Releasing 1port)
Note:
If no command is sent from the PC side to the NJR-CTB for 30 seconds, the NJR-CTB automatically
disconnects from that device.
