User`s guide

MBX Driver Help
Cyberlogic Technologies Inc. - 83 -
Adapter Watchdog Timer
Adapter cards that support Peer Cop have a diagnostic watchdog timer that, when
enabled, automatically places the adapter card in the off-line state if the host is inactive
for a pre-configured period.
While the driver is operational, it will always place an adapter card in the off-line state
when transitioning from the on-line to the off-line mode. However, in the event of a
system crash, the driver does not have an opportunity to properly change the adapter
card’s state. In this case, adapter cards that do not support the watchdog timer will not
respond to the command messages, resulting in lengthy timeouts on the Modbus Plus
network. Therefore, we strongly recommend that you enable the watchdog timer for
adapter cards that support it.
Timeout
The user may select the desired timeout interval, or disable the watchdog timer.
The recommended timeout is 2.5 seconds for adapter cards that support the watchdog
timer. For compatibility with older adapter cards, the default value is Disabled.
Operation
Polling Interval
This parameter specifies the polling interval, in milliseconds, that the driver will use when
running in polled mode.
The valid range for the polling interval is 20-1000 msec. The default value is 20 msec.
MicroChannel
Slot Number
This allows you to specify the slot number for the adapter card, a requirement for all
Micro Channel cards.
Valid Slot Numbers start from 1. The default for this parameter is 1.
Bus Number
The Windows architecture allows multiple buses of the same type in the same system.
This parameter specifies the bus number for the adapter card. The default for this
parameter is 0, and in most cases should not be changed.