insys icom GPRS 5.1, Руководство пользователя, Страница: 70 / 102

Functions INSYS GPRS 5.1 serial
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6.10 Virtual COM Port
Applications, which up to now communicated with the end devices
via a modem connection or directly via a serial interface, will not
function directly with TCP connections.
A virtual COM port is required, which will process TCP connections
on one side and make a COM port to the operating system availa-
ble on the other side. Click on the “Serial/VCom” tab.
INSYS icom offers a free virtual COM port for the operating systems Win-
dows XP/2000.
The virtual COM port provides the following functions:
6.10.1.1 Authentication for Outgoing TCP Connection:
Notification about a unique device ID via a UDP packet prior to the actual
TCP connection, or directly at the beginning of a TCP connection.
6.10.1.2 Information about New IP Address:
This setting will only apply to the operating mode TCP Listen. It is used to
communicate the just allocated IP address together with a unique device
ID to the server (IP address or domain name), when IP addresses are dy-
namically allocated.
6.10.1.3 Authentication for Incoming TCP Connection:
This setting will only apply to the operating mode TCP Listen. A TCP con-
nection is only accepted if the "caller" has sent a valid authentication via a
UDP packet in advance. This function is also used to terminate a "hanging"
TCP connection for the INSYS GPRS 5.1 serial (e.g. due to a network failure
or a crash of the remote terminal). When a valid UDP packet is received,
the existing TCP connection is terminated to be able to accept the new
connection. Please request more information about the virtual COM port
VCOM from insys@insys-tec.de.