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2. ScanDoc Development
3. Description of PassThru Commands

PassThru Connect Creating a protocol connection

Description

The function establishes communication according to the specified protocol. The adapter supports two independent diagnostic lines. Each protocol is associated with its own line. Line 1 is connected to pins 6 and 14 of the OBD connector and only ISO15768 and CAN protocols can be connected to it. Line 2 is switched, and other protocols can be connected to it.  The lines are independent, simultaneous operation of two protocols is allowed. For example, ISO15765 and ISO14230 or ISO15765 and ISO15765_PS. The PS prefix means that the protocol can be switched to the terminals of the OBD connector.
Protocols ISO15765 and CAN as well as ISO15765_PS and CAN_PS can work on the same physical line at the same time. This means that you can initialize up to 4 protocols in one adapter at a time. The set speeds for each protocol pair should be the same. For example, ISO15765 and CAN with a speed of 500 Kbit on 6 and 14 pins of the OBD connector and ISO15765_PS and CAN_PS with a speed of 125 Kbit on 3 and 11 pins.

long PassThruConnect(unsigned long DeviceID, unsigned long ProtocolID, unsigned long Flags, unsigned long BaudRate, unsigned long *pChannelID)

Options

• unsigned long DeviceID - PassThruOpen identifier stored during communication.
• unsigned long ProtocolID - Protocol number for further communication. It is taken from the file j2534_lib.h

  Protocols defined by J2534

  Definition	output	Description
  J1850VPW	2 VPW	Defined by SAE J1850 and SAE J2178 Can work simultaneously with CAN and ISO15765, Not compatible with dial-up protocols.
  J1850PWM	2, 10 PWM	Defined by SAE J1850 It can work simultaneously with CAN and ISO15765. Not compatible with dial-up protocols.
  ISO9141	7K,15L Line	Defined by ISO 9141 and SAE J1979 Can work simultaneously with CAN and ISO15765. Not compatible with dial-up protocols.
  ISO14230	7K,15L Line
  CAN	6H,14L CAN	Not processed CAN stream. It can simultaneously work with all protocols.
  ISO15765	6H,14L CAN	Defined by ISO 15765-4 and ISO 14229-1 UDS It can simultaneously work with all protocols.
  SCI_A_ENGINE		Not supported
  SCI_A_TRANS		Not supported
  SCI_B_ENGINE		Not supported
  SCI_B_TRANS		Not supported
  J1850VPW_PS	Switched VPW	Defined by SAE J1850 and SAE J2178 Can work simultaneously with CAN and ISO15765. Not compatible with dial-up protocols.
  J1850PWM_PS	Switched PWM	Defined by SAE J1850 standard. Can work simultaneously with CAN and ISO15765, Not compatible with dial-up protocols.
  ISO9141_PS	Switched K L Line	Defined by ISO 9141 and SAE J1979 Can work simultaneously with CAN and ISO15765. Not compatible with dial-up protocols.
  ISO14230_PS	Switched K L Line	Defined by ISO 9141 and SAE J1979 Can work simultaneously with CAN and ISO15765. Not compatible with dial-up protocols.
  CAN_PS	Switched CAN	Not processed CAN stream. It can simultaneously work with all protocols.
  ISO15765_PS	Switched CAN
  J2610_PS	Switched
  SW_ISO15765_PS	1 CAN
  SW_CAN_PS	1 CAN
  GM_UART_PS	Switched K Line

• unsigned long Flags - Flags to open the connection.

  Name of the constant	bit	Description
  ISO9141_K_LINE	12	Use L lines to initialize protocols. 0 = Used L-line and K-line for initialization 1 = Used only K-line for initialization
  CAN_ID_BOTH	11	Reception of both types of CAN identifiers for CAN and ISO 15765 protocols (see also bit 8) 0 = An 11 or 29 bit identifier is used as defined by bit 8 1 = 11 and 29 bit identifiers are accepted by the adapter. The setting of bit 8 is ignored.
  ISO9141_NO_CHECKSUM	3	Checking the checksum of a packet for ISO9141 and ISO14230 0 = The adapter generates and verifies the checksum as defined by ISO 9141-2 and ISO 14230-2. 1 = The adapter does not generate and does not verify the checksum.
  CAN_29BIT_ID	8	CAN identifier type for CAN and ISO 15765 protocols 0 = Packets with 11 bit identifiers are accepted. 1 = Packets with 29 bit identifiers are accepted.

• unsigned long BaudRate - Initial exchange rate. It is set in the range from 5 to 5,000,000 depending on the protocol. It can be reinstalled with PassThruIoctl or it will be forced to change after successful 5-baud initialization.
• unsigned long* pChannelID - Pointer to the installed channel. It is a collection of DeviceID or ProtocolID.

Returned error codes

Example

#include "j2534_lib.hpp"

unsigned long DeviceID;
long Ret;
unsigned long ChannelID;
unsigned long Flags = ISO9141_K_LINE_ONLY;

Ret = PassThruConnect(DeviceID, ISO14230, Flags, 10400, &ChannelID);
if (Ret != STATUS_NOERROR)
{	// Error handling
}

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