tina96e1-b (2016-12) VGC501_VGC502_VGC503.om 65
5 Communication Protocol (Serial Interface)
The VGC50x communicates with a computer via virtual serial interfaces (COM
ports). Thus the user software can access the VGC50x via USB Type B or via
Ethernet interface.
The corresponding driver for the virtual COM port is installed automatically, when
the VGC50x is connected to a computer via the USB Type B interface. If the driver
is not installed automatically, it can be downloaded from the FTDI website
(www.ftdichip.com/Drivers/VCP.htm).
The installed virtual COM port appears as additional serial interface in the device
manager of the computer.
With the Ethernet Configuration Tool a virtual serial interface (COM) can be as-
signed to an IP address. In addition, it allows configuration of the Ethernet interface
via a computer (→ 106).
The installed virtual COM port appears as additional serial interface in the device
manager of the computer.
When the VGC50x is put into operation, it starts transmitting measured values in
intervals of 1 s. As soon as the first character is transferred to the VGC50x, the
automatic transmission of measured values stops. After the necessary inquiries or
parameter modifications have been made, the transmission of measured values
can be started again with the COM command (→ 70).
Communication structure and procedures are identical for the three controllers
VGC501, VGC502 and VGC503. Therefore the term VGC50x is used in this
chapter.
It should be noted that mnemonics with channel specific parameters must be
issued with the number of values corresponding to the number of channels of the
respective device.
Example: VGC501
Transmit: OFC [,a]
VGC502
Transmit: OFC [,a,b]
VGC503
Transmit: OFC [,a,b,c]
Communication via USB Type B
interface
Communication via Ethernet
interface
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