Telex ISP-100 manual 2-9

2-9
Setup & Installation
General Purpose Inputs (GPI)
Figure 2-17 GPI connector pinout.
Figure 2-18 BNC cable example.
Synchronizing to an external clock source requires RG-58 or other
suitable 50Ω cable terminated with a BNC connector. A precision
(±5 ppm) clock source of 12.288 MHz, 6.144MHz, or 3.072 MHz is
supported. The Master Clock Input must be set to external from the
Properties for Merlin ISP-100 panel in the VUE-IT software. See
Figure 2-18 and page 7-6 of this manual for more information.
Dry (i.e. switch) or electronic (i.e. open collector) contact closure
should be sufficient. The closure can be either momentary (10 ms
minimum duration) or continuous. Connect the desired input (1-8)
through the contact closure to common (9). See Figure 2-17 for more
information.
Master Sync Input
If a permanent
contact closure is
used, the ISP-100
will remember the
QuickSET selected
even if the AC power
fails.