User`s guide

MBX Driver Help
Cyberlogic Technologies Inc. - 80 -
Network
Device Name
This parameter allows the user to assign a name to identify the device. The default for
this parameter is ClMbx#, where # is the selected device number.
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
The kernel mode device driver can operate in either polled mode or interrupt mode.
Selecting the proper mode of operation depends on the adapter card configuration. The
interrupt mode provides better performance than the polled mode, however, interrupt
mode requires more processor overhead. It is permitted to mix interrupt and polled
modes of operation for different cards in the same system.
Polled Mode / Interrupt Driven
The user may select the polled or interrupt mode of operation. The default is Polled
Mode.
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.