B&B Electronics Command Response Protocol HVD100A3 Manuale utente

HDV100A3 Command & Response Manual-1306cr Cover Page

B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5104

Model: HVD100A3

HDV100A3 Command

Response Protocol

Documentation Number: HDV100A3-4407CR

International Headquarters

B&B Electronics Mfg. Co. Inc.

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

Phone (815) 433-5100 -- General Fax (815) 433-5105

Home Page: www.bb-elec.com

Sales e-mail: orders@bb-elec.com -- Fax (815) 433-5109

Technical Support e-mail: support@bb-elec.com -- Fax (815) 433-5104

©B&B Electronics -- November 2005

HDV100A3 Command & Response Manual-1306cr Table of Contents i

B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5104

Table of Contents

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

Intelligent Mode 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.................................................................................... 16

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

ii HDV100A3 Command & Response Manual-1306cr

B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5104

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!

HDV100A3 Command & Response Manual-1306cr 1

B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5104

Introduction

The HDV100A3 adapter has two modes of operation: J1708 Intelligent and

J1939 Intelligent mode In Intelligent mode the HDV100A3 works with a

command protocol to control different operations of the HDV100A3.

The HDV100A3 performs several functions in the intelligent mode in order

to reduce the overhead and timing requirements of the host application when

communicating with the J1708 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 J1708 bus.

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.

Intelligent Mode Verification

To confirm that the HDV100A3 is in the Intelligent mode, set the host baud

rate to 115.2 KB 8,1,N. The host application can request the vendor number

from the HDV100A3 This is done by sending the following string in hex

from the host to the HDV100A3:

(01, 01, 05, 00, 07)

It will respond as follows:

Hex (01, 0B, 85, MM, DD, MA, M1, M2, MO, 00, VV, VV, 00, DB, CS)

An example of this command can be found on page 12 of this document.

The HDV100A3 does not need to be connected to a vehicle to respond,

however power must be supplied the HDV100A3.

2 HDV100A3 Command & Response Manual-1306cr

B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5104

Intelligent Mode 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

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

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

Number of Control

Bytes to Follow ID Byte Function

Byte Control Data Bytes

1 byte 1 byte 1 byte Up to 20 bytes

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

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.

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

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

Number of

Data Bytes Data Bytes

1 byte Up to 100 bytes

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

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.

HDV100A3 Command & Response Manual-1306cr 3

B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5104

Formatting the Control Bytes

The 2nd 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

=08Setmask

=X8 set filter X off

=X9 set filter X on

4 HDV100A3 Command & Response Manual-1306cr

B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5104

Detailed Description of General Function Codes

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:

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

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

HDV100A3 Command & Response Manual-1306cr 5

B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5104

RS-232 Baud Rate Setup

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.

Function Start

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

Setting UB3

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 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

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”

*Don’t care state.

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

Bit 2 Word Length (bits) Stop Bit Length

0 5,6,7,8 1 (default)

1 5 1½

1 6,7,8 2

6 HDV100A3 Command & Response Manual-1306cr

B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5104

Bits 1 and 0 set the word length

Bit 0 Bit 1 Word Length

0 0 5

0 1 6

1 0 7

1 1 8 (default)

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

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