B&B Electronics HDV100A3 User Manual

HDV100A3 Command

Response Protocol

Documentation Number: HDV100A3-0812CR

International Headquarters

B&B Electronics Mfg. Co. Inc.

707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350 USA

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Table of Contents

INTRODUCTION ........................................................................................ 1

OPERATION ............................................................................................... 1

Command Protocol ................................................................................ 2

Formatting the Control Bytes ................................................................. 3

DETAILED DESCRIPTION OF GENERAL FUNCTION CODES ....... 4

Command Acknowledgement ................................................................. 4

RS-232 Baud Rate Setup ........................................................................ 5

Setting Baud 1, Baud 2........................................................................... 7

Baud Rate Example ................................................................................ 8

Time Stamp Information ......................................................................... 9

Master Reset Command ....................................................................... 11

Vendor Information .............................................................................. 11

J1708 COMMANDS .................................................................................. 12

Receiving Data from the J1708 Bus ..................................................... 12

Transmitting Data to the J1708 Bus .................................................... 14

Set Filter Active .................................................................................... 15

Set Filter Off......................................................................................... 16

Broadcast Message .............................................................................. 17

J1939 COMMANDS .................................................................................. 19

Start Receive on J1939 Bus .................................................................. 20

Stop Receive on J1939 Bus .................................................................. 20

Arbitration Field (Y1, Y2, Y3, Y4) ........................................................ 21

Transmit Data to J1939 Bus ................................................................ 23

Set Mask ............................................................................................... 23

Set Filter 1 to 4 .................................................................................... 24

J1939 Header Worksheet ..................................................................... 26

ERROR CODES ........................................................................................ 27

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WARNING!

This Model HDV100A3 Converter Module allows
you to connect to active J1708 / J1939 networks.
It is possible that your transmissions through this
converter module could cause malfunction of the
network operation, damage to software or
equipment, or bodily harm.

Do Not Transmit Any Messages to the

network without a complete understanding

of the operation of the network.

B&B Electronics Mfg. Co. specifically disclaims
any responsibility for damage or injury to
software, hardware, equipment or persons as a
result of using this product.

WARNING!

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Introduction

The HDV100A3 works with a command protocol to send and receive data
from J1708/J1587 and J1939 vehicle networks. Networks can be addressed
individually or to/from both at once if they are both present on the vehicle.

Note that the HDV100A3 is powered from the vehicle side of the interface.
If the device is to be used without a vehicle, it will be necessary to connect
power to the device through the 15-pin connector. Positive voltage is
connected on pin 8. Pin 7 is connected to ground.

Operation

The HDV100A3 performs several functions in order to reduce the overhead
and timing requirements of the host application when communicating with
the J1708 and J1939 bus. The device handles collision detection and retries
with no additional interaction from the host application. This greatly reduces
the processor overhead required by the host in order to communicate
efficiently with the vehicle bus.

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SOF

Number of

Control Bytes

Control Bytes

Number of

Data Bytes

Data Bytes

CS

1 byte

1 byte

1 to 20 bytes

1 byte

1 to 100 bytes

1 byte

Number of Control
Bytes to Follow

ID Byte

Function Byte

Control Data Bytes

1 byte

1 byte

1 byte

Up to 20 bytes

Number of
Data Bytes

Data Bytes

1 byte

Up to 100 bytes

Command Protocol

The HDV100A3 uses a simple protocol to communicate to vehicle bus. The
protocol is divided into four parts:

Start Of Frame (SOF)
Control Field (shown in light gray)
Data Field (shown in dark gray)
Checksum (CS)

Intelligent Mode Message Structure

The Start of Frame byte is the first byte in a valid frame and is

always 01 hex.

The Control Field sets up the function and control of the

HDV100A3 hardware and is formatted as shown below.

Control Field Structure

the message. This value indicates the number of control bytes, excluding
itself, to follow. If the message doesn’t contain any control bytes, the
Number of Control Bytes value will be set to 00 hex as a placeholder.

is preceded by the number of data bytes, excluding itself, to follow and is set
to 00 hex if no data is present in the message. The data field is reserved for
data that is to be communicated to the vehicle bus.

Data Field Structure

is calculated by adding ALL bytes from the Start of Frame (inclusive) to the
last data byte and using the last 8 bits as a checksum.

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The first byte of the Control Field is the number of control bytes in

The next part of the message frame is the data field. The data field

The last element of a valid message is the checksum. The checksum

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Formatting the Control Bytes

The 2

nd

byte is “Number of Control Bytes” to follow and always
precedes the control field. The third byte is the ID byte. This byte tells the
hardware where to direct the message. Valid entries for functions are:

ID Codes

=01 Message for J1708
=02 Message for J1939
=08 General message (for control of the HDV100A3 device)
=05 Device identification (reverse compatible)

The fourth byte is the function byte. The functions that are
supported are listed below. Note that some of the function codes are followed
by additional bytes of information. These bytes must be included in the
control byte count.

Valid General Function Codes
Function codes

=01 change PC baud rate, followed by 3 bytes (UB3, Baud1, Baud2)
=02 send time stamp
=04 hardware handshaking
=08 reset converter, followed by 2 bytes (01,and 02)
=10 time stamp off
=20 time stamp on

Valid Entries for J1708 Functions
Function codes = 07 set broadcast message

= X8 set filter X off
= X9 set filter X on
= 11 Sync with J1708 bus and start reception
= 10 Stop reception
= 12 Transmit to J1708 bus

Valid Entries for J1939 Functions
Function codes =00 Receive off
=01 Receive on
=02 Transmit message
=08 Set mask

=X8 set filter X off
=X9 set filter X on

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Detailed Description of General Function Codes

Byte
Number

Byte
Value

Function
1

01

Start of frame

2

01 or 03

Number of control bytes = 1 for ACK, 3 for NACK

3

aa

ID byte 08 = internal command

4

bb

Function code 02 = send time stamp

5

cc 6

00

Number data bytes

7

CS

Checksum

Command Acknowledgement

All commands sent to the device will be acknowledged. If no error occurs an
ACK will be sent with the ID byte that accompanied the command. If an
error occurred, a NACK will be sent with the ID byte that accompanied the
command as well as a Function code of $05 and the Error Code. The
responses will not be shown for each command since it is the same for almost
all commands. Below is the format of the ACK/NACK response. If an
ACK/NACK response is different for a particular command, it will be
specified.

ACK/NACK Format:

aa – ID Byte
$01 = J1708 Interface
$02 = J1939 Interface
$05 = Device Id
$08 = RS-232 Interface
$09 = Message Xmit OK Response
bb – FC Byte
None = Command Received and Valid
$05 = A error was detected, NACK
cc – CD Byte
None = No Error Condition
Error Code = See Section 5.10

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RS-232 Baud Rate Setup

Function

Start
of
Frame

Control
Bytes

Command
Code

Function
Code

UB3

Baud
1

Baud
2

Data
Bytes

Check
Sum
Byte #

1 2 3 4 5

6

8

9

10

Value

01

05

08

01 00

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Divisor
Latch

Set
Break

Set
Parity

Even
Parity

Parity
Enable

Stop
Bits

Word
Length 1

Word
Length 0

Bit 5

Bit 4

Bit 3

Parity Selection

*

*

0

No parity (default)

0

0

1

Odd parity

0

1

1

Even parity

1

0

1

Force parity “1”

1

1

1

Force parity “0”

Bit 2

Word Length (bits)

Stop Bit Length

0

5,6,7,8

1 (default)

1

5

1½

1

6,7,8

2

To set the baud rate for the RS-232 port, set a general command code of 08.
Set the function code to 01. Then set 3 control bytes as follows.

Setting UB3

Bit 7 = 1 allows baud rate divisor to be changed. 0 baud rate change is
blocked. Bit 7 should not be set. The setting and resetting of this bit is
handled internally.

Bit 6 = 1 forces the transmitter output to a logic 0 for alerting the remote
receiver to a line break. 0 indicates no break condition.

Bit 5, 4 and 3 work together to set parity

*Don’t care state.

Bit 2, stop bit, works in conjunction with bits 1 and bit 0

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Bit 0

Bit 1

Word Length

0 0 5

0 1 6

1 0 7

1 1 8 (default)

Bits 1 and 0 set the word length

Default value. The HDV100A3 should always be set to 8-bit word length.

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