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DVDO AVLab TPG - 4K Test Pattern Generator

DVDO AVLab TPG 46 A.04

Appendix A: Virtual Serial Command Protocol

Virtual Serial over USB:

Using a specific virtual serial driver, AVLab-TPG will be connected to a laptop running Calman and able to

bring up specific test patterns on command. AVLab-TPG will emulate Duo for these commands according

to the following table:

Note that final spec is to function with Calman 5

Baud Rate 115200 (default)

Data Bits 8

Parity None

Stop Bits 1

Flow Control None

The protocol is based on ASCII characters. Four ASCII non-printable control characters are used.

ASCII

Hex

Description

NULL

$00

Ignore or End of String

STX

$02

Start of text

ETX

$03

End of text

SPACE

$20

‘Space’ key on keyboard

The list of all ASCII characters used by the AVLab serial automation protocol and their hexadecimal

equivalent values are given in Section 9.

Each transaction from either the system controller or the AVLab has the following formats

STX [Transaction Type] [Data Count] [ID] NULL [Value] NULL ETX

STX [Transaction Type] [Data Count] [ID] NULL ETX

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 75 76

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DVDO AVLab TPG Guía de usuario Pagina 46