Receive ISO15765-2 Multiframe Message

Receive ISO15765-2 Multiframe Message

Vehicle Spy has the ability to transmit and receive multiframe messages using the ISO15765-2 specification for CAN networks. The first few steps for setting up a receive multiframe message are the same as setting up a normal message. Set the Description, Type, Arbitration ID, and color in the Messages Editor Receive table. After that, ISO15765-2 needs to be selected from the Multi column. This tells Vehicle Spy to use the ISO15765-2 protocol for receiving this message.

In the message setup area, click the "Multiframe Setup" button. A dialog opens for configuring the flow control frame parameters (Figure 1).

Rx Message Filter tab: Enables and sets up Extended addressing.

Transmitted Flow Control tab: Sets the flow control frame Arb ID, block size, STmin, and padding value.

Block Size (BS) - requested number of frames to send per block between flow control frames (0 = no limit).

Separation Time Minimum (STmin) - requested minimum separation time between each frame in a block (0 = send as fast as possible).

Padding Character - value used to pad the flow control frame out to 8 data bytes long.

Examples:
Arb ID = 7E0, BS = 0, STmin = 0, Padding = none ==> flow control frame $7E0 30 00 00 (default).

Arb ID = 777, BS = 5, STmin = 100, Padding = BB ==> flow control frame $777 30 05 64 BB BB BB BB BB.

Timeouts tab: Determines how long to wait between incoming frames before giving up. The Consecutive Frame Timeout is the maximum time allowed between consecutive frames in a block. If the timeout is exceeded, Vehicle Spy will stop the multiframe exchange by no longer sending flow control frames.

Figure 1: Click the "Multiframe Setup" button to see these setup tabs for the Flow Control Frame.

Last Update: Friday, October 31, 2008