Bio-Rad Model 2110 Fraction Collector - Manual (Page 21)

Pin Function Signal Type
6 External Start Input
7 Advanced Contact 1 Output
8 Advanced Contact 2 Output
9 Logic Ground
External Advance (Pin 1)
The External Advance line performs two functions. It causes the
instrument to enter the Remote mode when held low for longer than two
seconds, and it causes the carousel to advance one position each time a
high-going pulse is applied. To use the control line to advance the
carousel, connect pin 1 of the 9-pin “D” connector to pin 9 and hold for
at least 100 msec, then release. Alternatively, the carousel will advance by
applying an external signal (TTL low logic level ) to pin 1 for at least 100
msec (with a return to TTL high logic level state). Be sure to connect the
controlling instrument’s ground to the fraction collector’s logic ground,
pin 9. When remote mode is entered (by holding pin 1 low for greater than
2 seconds) the time and drop mode features of the collector are disabled
and the front panel control function is lost, with the exception of the man-
ual tubing advance key, which will function normally. The remote mode
is indicated by three horizontal bars on the fraction collector display.
Drops
The fraction collector will generate a 50 msec TTL pulse on pin 2
every time a drop is detected.
Advanced
Each time the carousel is advanced, a low-going TTL pulse is gener-
ated on pin 3. This signal is useful for triggering the event mark input of
a chart recorder to indicate fraction intervals. If the recorder being used
does not support TTL signals, then see below under “Advanced Relay
Contacts to trigger the event input.
Ready
A low level signal on pin 4 indicates that the fraction collector is func-
tioning properly and that it is ready to accept input from a controlling
device.
Alarm
If the fraction collector is unable to carry out an external advance
command due to a malfunction (such as a jammed carousel), a low level
will be held on pin 5 until the problem is cleared.
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