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Controlling the LDP-QCW via USB
Introduction
Introduction
Introduction
Introduction
In addition to the PLB-21, the LDP-QCW also has a USB interface to communicate with a
computer/laptop. This interface allows communications over a serial text interface as well as using the
PicoLAS protocol. While the text interface is designed for communication with a terminal program,
the PicoLAS protocol is designed as a system interact protocol.
The switching between the two protocols occurs automatically as soon as the LDP-QCW receives a
certain sequence. The corresponding commands are:
•
PING
PING
PING
PING for the PicoLAS protocol
•
“init
init
init
init” followed by <Enter> for the text interface
Description of the USB Interface
Description of the USB Interface
Description of the USB Interface
Description of the USB Interface
The USB connection of the LDP-QCW emulates a virtual COM port under Windows. The necessary
drivers can be downloaded free of charge under
http://www.ftdichip.com/Drivers/VCP.htm
, or they
are already included in the current Linux kernels. The virtual COM port created by this can be
addressed like a regular one. The connection settings are:
Baud rate
115200
Data bits
8
Stop bits
1
Parity
even
