Product Manual
Table Of Contents
- CHAPTER I PRODUCT INTRODUCTION
- 1.1 INTRODUCTION
- 1.2 F7S HOST STRUCTURE
- 1.3 VCI BOX STRUCTURE
- CHAPTER II HOST ON/OFF AND FUNCTION MENU
- 2.1 HOST CHARGING
- 2.2 BOOTING
- 2.3 SHUTDOWN
- 2.4 INTRODUCTION TO EACH MENU OPTION
- CHAPTER III VEHICLE DIAGNOSIS
- 3.1 PRE-DIAGNOSTIC TECHNICAL REQUIREMENTS
- 3.2 VEHICLE CONNECTION
- 3.3 VEHICLE TYPE SELECTION
- 3.4 DIAGNOSIS AND OTHER HIGH-LEVEL FUNCTION
- 3.5 DIAGNOSIS
- 3.6 SPECIAL FUNCTION
- 3.7 GENERAL OBDII (FOR GASOLINE MODELS)
- 3.8 DEMO ON THE FCAR F7S AND DIAGNOSTIC SOCKET CON
- CHAPTER IV DATA MANAGEMENT
- CHAPTER V REMOTE DIAGNOSIS
- CHAPTER VI REFERENCE
- CHAPTER VII UPDATE
- CHAPTER VIII SETTINGS
- CHAPTER Ⅸ COMPLIANCE INFORMATION
- WARRANTY CLAUSES
FCAR Product Manual
39
Common Communication Protocols
Protocol Name
Name of the
Communication Line
Range of Voltage
For Reference
Hole Number
of Jumper to
Be Connected
K Line
Communication
K
1V lower than the
battery voltage
7
CAN
Communication
CAN-H
2.5V＋0.25V
6
CAN-L
2.5V
－
0.25V
14
J1708
Communication
J1708-A
3V~5V
7
J1708-B
0V~2V
15
RS232
Communication
RS232-TD
(-9V) ~ (-5V)
7
RS232-RD
0V~0.7V
15
Yuchai Natural
Gas
Terminal A (5.5V)
7
Terminal B (4.5V)
15
Terminal C (GND)
GND
The steps of connecting are given as follows, using K line communication and CAN
communication as an example：
Steps to Connect K Line to the Diagnostic Socket
The signal line’s voltage of K line is 1V lower than that of the battery. For example, the
voltage of the accumulator is 12V, so the voltage of K line’s signal line is about 11V. The
signal line’s voltage will be 23V if the voltage of the accumulator is 24V. There might be
a deviation with its value being from -0.25 to +0.25 when the voltage of the vehicle’s
diagnostic socket’s pins is measured.