BR16F84-1.07 ETC, BR16F84-1.07 Datasheet - Page 9

• Manufacturer Part Number: BR16F84-1.07
• Description: OBD II Interface Chip
• Manufacturer: ETC

Interface Chip Changes for later versions:
This document specifies the changes in chip operation for later versions.
It defines how to use it for ISO 14230 for both fast and slow initialization.
There are also some changes that may affect useage for PWM and VPW.
The major changes to existing protocols are summarized below:
(1) For ISO 9141, The address byte is now also transmitted.
(2) For ISO 9141, Both keybytes are returned, rather than one.
(3) The ISO 14230 protocol is now supported.
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Notes:
(1) All data bytes are in Hexadecimal.
(2) XX indicates a byte which is not defined, reserved, or unknown.
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CHIP CONNECT SEQUENCE: (This sequence is unchanged)
PROTOCOL SELECTION SEQUENCE:
VPW:
PWM:
ISO 9141:
ISO 14230 (Fast Init):
ISO 14230 (Slow Init):
The extra byte is also returned for SAE modes, but unused.
Send
Receive
Send
Receive
Send
Receive
Send
Receive
Or
Send
Receive
Where R1 to R5
Normally R1-R5= C1, 33, F1, 81, 66
Where S1, S2...... is ISO14230 Start Communications Response message.
20
FF
41, 00
02, 00, XX
41, 01
02, 01, XX
42, 02, adr Where adr is the address, (normally 33 hex).
02, K1, K2
82, XX, XX
46, 03, R1,R2, R3, R4, R5
S1, S2, ..........
Note: More than one ECU may respond in sequence. The response
S1, S2,... = 83, F1, 10, C1, E9, 8F, BD
Same as ISO 9141.
may also be a negative response code.
A typical positive response message would look like this;
is ISO14230 Start Communication Request Message;
Where K1, K2 are the ISO Keybytes.
Indicates failure to initialize ISO 9141