TransCore IT241005422 Manual De Usuario

[<data>]

 - the data field may be of length from 0 to 1021 bytes and is associated 

with each specific response. See “Command List” on page D-10, for a complete list-
ing of tag commands.

<crc>

 - cyclic redundancy check, or CRC, is 2 bytes or 16 binary bits long, denoting 

a CRC-XMODEM result generated on each message byte exclusive of the 

<som>

 and 

<eom>

. The polynomial for the CRC calculation is X

16

+X

12

+X

5

+1 with a feedback of 

1021H for a XMODEM type CRC.

<eom>

 - end of message aids in finding the end of the message. All data after the 

<eom>

 is ignored until the next 

<som>

 is detected. The end of message is defined as 

the ASCII character 

%

.

The programmer and host interface use the data acknowledge protocol as noted below. 
Binary-coded integer messages contained in a protocol are defined by:

<som> <seq #> <len> <resp> <crc> <eom>

where

<som>

 - start of message finds the start of the next message following a message time-

out or following the end of the previous message. All data is ignored until the 

<som>

 

is detected. The start of message is defined as the ASCII character 

&

.

0000H

Command complete

0001H

Command in progress

0002H

Command data invalid

0003H

Command invalid

0004H

Command aborted

3XXXH

Tag data

3000H

No-Tag Data Status Code 

3001H

IT2200 Tag Data Status Code 

3002H

Reserved

8XXXH

Diagnostic data

8000H

Power-Up Diagnostic Report Status Code 

8001H

Background Diagnostic Report Status Code

8002H

Download Active

AXXXH

Diagnostics Statistical Data