Examples of other devices controlling PSYLAB are: connection of a remote button such that the operator or the subject can indicate an event, response or reaction time; link-up to another computer which has been user programmed with a task (e.g. using MEL or ERTS), such that PSYLAB can synchronise with actions in the task (this can be easily done using the task computerís printer port).
TTL requires a ground wire to be run from the grount terminal of BIN8 to the external device. TTL input is registered as a number between 0 (all low, below 0.4V) and 255 (all high, above 3V).
The SAM 8 bit event connection relates to pins 1 to 8 of the event port, pin 9 is +5V @100mA, pin 10 is ground. It may be used directly by simply connecting up to the 15 way socket, but the safest way to use it is via the BIN8 unit, which provides a safety buffer between external devices and sensitive SAM circuitry, in addition to allowing latched control of relay and TTL outputs.