ASCII "?" only), or to transmit capture strings (automatically when available, or on request). The format of the
output strings is ASCII, see the technical specifications at the end of this document for details.
i
Please note:
If a serial interface sends capture events automatically, they can’t be
read via PCI-bus, because they are deleted from the buffer memory after
transmission.
6.2.4 Time capture inputs
Capture 0 (CAP0) and Capture 1 (CAP1) of the standard port can be enabled by using the DIP switch for the
D-SUB9 connector in the slot bracket. This allows any events to be recorded at any time. If a falling TTL
edge is detected at one of these inputs, the microprocessor stores the number of the input and the current time
in a buffer memory which can hold up to 500 entries. The capture events can be displayed using the monitor
program or sent via the serial interface COM1.
The buffer memory can be used to record either a time-limited, fast sequence of events (interval down to
1.5 msec) or a continuous sequence of events with a lower repetition time (depending on the transmission rate
of COM1). The output string consists of ASCII characters, a detailed description can be found in the back of
this manual. If the buffer memory overflows, a message ("** capture buffer full" is output, if the time interval
between two events at the same input is too short, the message "** capture overrun" is displayed and sent.
18
Date: 6th May 2021
TCR180PEX-EL
