Owner manual

4.1.4 USB Communication
The VK204-25-USB is a USB device that offers identical communication protocol as the serial comport.
capable of communicating via a USB interface. The USB communications are identical to the serial commu-
nications. Communication is via a virtual com port, which is created in the operating system by the drivers
necessary to install the USB display. The VK204-25-USB communicating via USB is capable of baud rates
of 19,200 bps to 115,200 bps. Other baud rates are subject to the limitation of the virtual com port driver. For
further information regarding supported operating systems, and driver limitations please contact technical
support.
4.2 Changing the I
2
C Slave Address
Syntax
Hexadecimal 0xFE 0x33 [adr]
Decimal 254 51 [adr]
ASCII 254 “3” [adr]
Parameters
Parameter Length Description
adr 1 The new I
2
C write address (0x00 -
0xFF).
Description This command sets the I
2
C write address of the module between 0x00
and 0xFF. The I
2
C write address must be an even number and the read
address is automatically set to one higher. For example if the I
2
C write
address is set to 0x50, then the read address is 0x51.
NOTE The change in address is immediate.
Remembered Always
Default 0x50
4.3 Changing the Baud Rate
Syntax
Hexadecimal 0xFE 0x39 [speed]
Decimal 254 57 [speed]
ASCII 254 “9” [speed]
Parameters
Parameter Length Description
speed 1 Hex value corresponding to a baud
rate.
Matrix Orbital VK204-25-USB 16