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621 Technologies Inc.
410 Albany St. Petrolia ON
1-519-333-3361
Revision 2.2
JAN 22 2018
Subject to change without notice
1. Transmit first unlocking message:
PGN
SA
DATA
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
0xFF00
0x54
0x55
0x55
0x55
0x55
0x55
0x55
0x55
0x55
Zettlex incOder Zero Point Set & Reset
To prevent accidental modification of Zero Point (datum from which angle is
measured) the unit should be “unlocked” before accepting the request. The
procedure is described below:
J1939 Glossary / Abbreviations
PDU
Protocol Data Unit
PF
Protocol Data Unit Format , 8-Bit Feld Identifier
PS
Protocol Data Unit Specific, 8-Bit Feld Identifier
PGN
Parameter Group Number
SA
Source Address
2. Transmit second unlocking message:
PGN
SA
DATA
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
0xFF00
0x54
0xAA
0xAA
0xAA
0xAA
0xAA
0xAA
0xAA
0xAA
3. Transmit the control request message:
PGN
SA
DATA
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
0xFF00
0x54
Command
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Command values:
2 – Zero Point Set
3 – Zero Point Reset
All three messages should be transmitted in sequence from the source address 0x54 (84). After the first unlocking
message is received the one second time window is opened. Other messages should be received within this time
window or the timeout will occur and the receiver will reset.
AZEI-002 - J1939 Output
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