User manual

Options Screen cont. – Section 30-C
Protocol Options cont.
 Blk Int affects the protocol timing. The current default value is 55. To get the
highest sample rate possible in the Measuring Blocks screen, set this to 25.
Note, however, that this may cause unreliable communications with some
controllers.
 Char lnt also affects the protocol timing. The current default value is 1. To get
the highest sample rate possible in the Measuring Blocks screen, set this to 0.
Note, however, that this may cause unreliable communications with some
controllers.
 KP2 Time only applies to controllers using the KWP-2000 protocol. The current
default value is 25. Decreasing it increases the sample rate in Measuring Blocks
on control modules that use the KWP-2000 protocols. The default value should
work for all applications, but if it does not, you can always increase it again (to a
maximum of 99).
 CAN Timeout defines how much longer than normal VCDS is going to wait for
the module to respond to a given message. Do not change this value from the
default value of zero unless you are having difficulties communicating with
a particular controller. Contact us for advice if you are.
Init Parameters
 Bypass OBD-II Fastinit should only be checked if you are experiencing difficulty
connecting to a vehicle using generic OBD-II.
 Bypass CAN Init should only be checked if you do not want VCDS to try
connecting to vehicles using the CAN-Bus.
 Force K on Engine is used on Engine controllers that have a choice of using
CAN-Bus or k-line for diagnostics, such as the Mk5 Jetta 2.5L. This feature can
be useful since the K-line often delivers faster sample rates while datalogging
than does the CAN-Bus on modules that support both. Since some modules talk
only via CAN, this box is unchecked by default.
 Boot in intelligent mode is checked by default. It allows VCDS to quickly
determine baud rates when using a HEX interface. If you wish to try using your
Ross-Tech dongle interface with 3rd party software (which is not supported by
Ross-Tech), you may want to run a Test, then uncheck Boot in intelligent
mode then run another Test. This will cause the interface to behave like an older
style “dumb” interface and will not be compatible with most 6J Ibizas. When
unchecked, it will be noticeable slower building the list of installed modules on
the Select Control Module screen.
Reduce CPU Usage checkboxes will greatly increase responsiveness of other apps
running at the same time as VCDS. The disadvantage is a somewhat reduced sample
rate.
 KWP-1281: The default state for this box is unchecked. This reduces
CPU usage when connected to controllers using KWP-1281. Using this
feature *may* make the session with some control modules unreliable.
 KWP-2000: The default state for this box is unchecked. This reduces
CPU usage when connected to controllers using KWP-2000.