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ELM327
ELM327DSJ Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
v1.0
Features:
-Multi-protocol chip supports SAEJ1850
PWM, SAEJ1850 VPW, ISO9141-2,
ISO14230-4, and ISO15765-4 OBDII
protocols.
-Communicates with a PC at 9.6 or 38.4 kbps
AT Commands:
@1, <CR>, AL, BD, BI, CAF0, CAF1, CF,
CFC0, CFC1, CM, CP, CS, CV, D, DP, DPN,
E0, E1, H0, H1, I, IB10, IB96, L0, L1, M0,
M1, MA, MR, MT, NL, PC, R0, R1, RV, SH,
SP, ST, SW, TP, WM, WS, Z
Programmable Parameters:
none
v1.0a
New Features:
-Minor J1850 VPW timing adjustment for
some 1999 and 2000 GM trucks.
New AT Commands:
none
Programmable Parameters:
none
v1.1
New Features:
-Programmable Parameters
-User control over CAN flow control
messages
New AT Commands:
FC SD, FC SH, FC SM, PP FF OFF, PP FF
ON, PP OFF, PP ON, PP SV, PPS
Programmable Parameters:
01, 02, 03, 09, 0A, 0D, 10, 11, 13, 16, 17, 18,
24, 25, 26, 29
v1.2
New Features:
-RS232 baud rates are adjustable to 500 kbps
-Programmable Parameters can all be reset
with a jumper
-Introduced Adaptive Timing
-Added SAE J1939 support (protocol A)
-Added user defined CAN protocols B and C
-KWP protocols allow four byte headers
New AT Commands:
AR, AT0, AT1, AT2, BRD, BRT, DM1, IFR H,
IFR S, IFR0, IFR1, IFR2, IIA, KW0, KW1,
MP, SR, WM
New Programmable Parameters:
00, 04, 06, 07, 0C, 2B, 2C, 2D, 2E, 2F
v1.2a
New Features:
-Minor changes to improve error detection
New AT Commands:
none
New Programmable Parameters:
none
v1.3
New Features:
-Added ability to state the number of
responses desired
-New CAN CRA commands to help with
setting the mask and filter
-Able to send CAN RTR messages
-New STOPPED message for user interrupts
during searches
-Introduced LV RESET message for resets
from low voltage
-New @2 and @3 commands for storing of a
unique identifier
Version History
We are often asked about the differences between
the various ELM327 integrated circuits. The following
summarizes some of these for you:
90


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