UART Timing - neoVI

UART Timing - neoVI
Main

Applies to
neoVI Blue, neoVI Red, neoVI FIRE, and neoVI Yellow

The UART network supports software programmable timing parameters. These include the baud rate and time delimiters as described in the ISO9141/Keyword 2000 specs.

First, you can setup a baud rate. Intrepid Hardware Explorer provides you with many common UART speeds present in Vehicle Networks to choose from.

In normal UART operations timing delimiters specify how messaging takes place. These settings are shown in Figure 2 below. The settings are explained in table 1 below.

Figure 1 - You can setup a baud rate for UART communications.

Figure 2 - The timing specifications used in ISO communications for message delineation.

Table 1 - Descriptions of timing parameters in ISO/UART

Timing Parameter	Parameter Name	Description
Rx Inner Frame Spacing	Receive Inter-frame Separation	neoVI determines when a message ends using this parameter. If no data byte has been received within this period the end of message is signaled.
Tx Inner Frame Spacing	Transmit Inter-frame Separation	This is the delay the transmitter will wait between two message transmissions.
Tx Inter byte Spacing	Transmit Inter-byte Separation	This is the delay that neoVI uses between each transmit byte.

The Message Termination section allows you to choose how frames are spaced. Select Inner Frame Time for ISO9141 or Keyword 2000 networks. For GME CIM-SCL networks select GME CIM-SCL.

Figure 3 - If working with a GME CIM-SCL network select GME CIM-SCL.

Last Update: Monday, May 24, 2010