Robert Bosch Pty Ltd VIMA01 Benutzerhandbuch

PROTOCOL SPECIFICATION

F005VP0801

ROBERT BOSCH

(AUSTRALIA) PTY. LTD.

A.B.N. 48 004 315 628

SMARTRA III IMMOBILISER

Page 13 of 49

Issue Number:

1.0

Dev No.

3881

Valid from:

14/2/06

Print Date:

28 March, 2007

DEV04205.9/I-1

4. MESSAGE STRUCTURE BETWEEN EMS AND SMARTRA

The proposal for the message structure between the Smartra and the EMS is based on the existing
communications protocol with two additional messages and some modified existing messages. The new
messages and modifications are highlighted in yellow.

4.1.1 Data Packet Breakdown

The protocol between the Control Unit (CU) [EMS] and the SMARTRA is defined as :-

Address

Length

Action

Data

length

checksum

The protocol between the SMARTRA and the CU is defined as :-

Address

Length

Data

length

checksum

where :-

Address = 49h (ASCII 'I') when CU is addressing SMARTRA.

= 69h (ASCII 'i') when SMARTRA is addressing CU

Length  = number of bytes following the Length byte (including checksum)
Action  = valid SMARTRA actions are :-

06h (ACK)

Acknowledge

53h (ASCII 'S')

Software version

4Bh (ASCII 'K')

Transponder IDE*

41h (ASCII 'A')

Transponder Authentication (Additional info for ID Matching)

57h (ASCII 'W')

Transponder Write EEPROM page

52H (ASCII 'R') Transponder Read EEPROM page

4Eh (ASCII ‘N’)

[Neutralise] a [Learnt] Smartra**

54h (ASCII ‘T’)

Teach a Smartra**

15h (ASCII nak)

Negative response*

Note:

* Modified existing message.
** New messages added.

Data

= data to be exchanged between units.

= Checksum - one byte addition of all bytes (excluding address).

The ASCII code naming convention was carried over from existing protocol.

For every message sent to the SMARTRA from the CU there will be a response from the SMARTRA
unit. Only one command can be sent at a time to the SMARTRA unit.

A negative response to any command is possible and is defined in Section 4.10.