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PC104-PLUS1500
Start bit, stop bit
Synchronous
Synchronous
transmission
Throughput rate
Timer
Trigger
Turn-off time
The start bit marks the beginning of a character string. The
following stop bits allow that the receiver has sufficient time in
order to adjust to the receiver before the beginning of the
following sign. that he can adjust to the receiver
In hardware, it is an event that occurs in a fixed time
relationship to another event. In software, it refers to a function
that begins an operation and returns to the calling program
only when the operation is complete.
Transmission in which data bits are sent at a fixed rate, with
the transmitter and receiver synchronized. Synchronized
transmission eliminates the need for start and stop bits with
every character.
The maximum repetitive rate at which data conversion system
can operate with a specified accuracy. It is determined by
summing the various times required for each part of the system
and then by taking the inverse of this time.
The timer allows the adaptation of program processes between
processor and peripheral devices. It usually contains from each
other independent counters and can be programmed for several
operation types over a control word register.
Internal trigger:
A software generated event that starts an operation.
External trigger:
An analog or digital hardware event from an external source
that starts an operation.
Digital trigger:
An event that occurs at a user-selected point on a digital input
signal. The polarity and sensitivity of the digital trigger can
often be programmed.
Time in which after switching-off the control current, the
output current falls to 10% of the final value.
Appendix
47
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