HW Group PortStore5, Руководство пользователя, Страница: 18 / 36

PortStore5 Manual HW group
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T: IP mode TCP
Switches between TCP and UDP protocols. UDP communication is faster but prone to lost packets or out-
of-order delivery; therefore, it is only suitable for communication on a local network segment in a request-
response mode, usually to convert RS485 communication.
The “
broadcast Rcv ” parameter allows receiving broadcasts.
0: TCP
1: UDP with broadcast Rcv Off
2: UDP with broadcast Rcv On
V: NetworkVirtualTerminal Off
Network Virtual Terminal enables interpretation of Telnet sequences, including certain RFC2217
extensions that enable on-the-fly changes of serial port parameters (speed, parity, etc.). NVT
description can be found at our website: >> “Support & download” >> “
NVT (Network Virtual
Terminal) protocol description ”.
When communicating with the serial port using telnet, e.g. with the TeraTerm program or the
Hercules utility, NVT should be enabled. If you don't want to use this option, set your client to “RAW”
communication mode.
0: Off (do not use telnet control codes, pass through to serial port)
1: On (accept telnet control codes)
K: Keep connection Off
Keeps TCP connections alive to avoid automatic termination upon timeout specified by the B: IP
protocol retry time parameter. When enabled, the device sends a NVT NOP command
approximately every 5 seconds to check the connection state. If port sampling is enabled with the #T:
Trigger AND mask parameter, the device sends an I/O keep command (FF FA 2C 37 ..) instead of a
NOP (see #K, #L, #M, #N). NVT must be enabled for this parameter to take effect – when NVT is off,
PortStore5 repeats the last packet sent and the Keep function is dependent on the remote TCP
implementation.
0: no keep connection (prefered)
1: keep connection
E: Erase buffer on Open connection
Clears the internal device buffer whenever a connection is established or closed. This option is useful
for instance when your remote peripheral periodically sends some kind of “I'm alive” characters, you
only need to access it once in a while, and receiving all these characters from the buffer wastes time.
0: none
1: Close TCP/IP connection
2: Open TCP/IP connection
3: Open & Close TCP/IP connection
UDP/IP mode does NOT support :
- NVT commands
- TEA authentication
Challenge-response protocols
respond up to 40% faster.