User's Guide

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5.2 RX20K to USB Host Block Messages

Table 9 - RX20K to USB Host Block Message Format

byte

index

byte variable, all

variables start with

USBmsg2host.name.

Description

hdr.stx

header start char,

always 0x55

hdr.len

# of bytes following

this byte in the USB msg

to the host (always even

and ≥ 52). # of header

bytes is fixed at 44

(not counting stx and

len). # of sample bytes

is normally 200 (100 16

bit samples) but could

be some other even #. #

of TX status bytes is

fixed at 8 and are

always the last 8 bytes

in the message. So len

is normally 44 + 200 + 8

= 252.