MobileView PENTA, Руководство по установке

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Chapter 3: DVR installation
MobileView PENTA Installation Manual 31
Figure 25: J3 digital inputs connection
Digital inputs
Each open collector digital input treats an input voltage between 5 to 30 VDC
with respect to digital ground as activated or closed. Inputs less than 1 VDC are
treated as deactivated or open. Voltages between 1 to 4 VDC have no guarantee
of being seen as activated or deactivated.
Refer to Chapter 5
“Optional hardware installation” on page 67 for more
information on connecting digital inputs to peripheral devices.
Ground link
As stated above, digital input voltages are measured with respect to digital
ground. The ground link jumper connects the DVR electrical ground to the digital
ground. For special installations where a digital input electrical reference return is
different from the DVR electrical ground or where ground isolation is needed,
remove the ground link jumper and attach the alternate ground reference to
connector J3, terminal 10.
WARNING: Never connect the MobileView PENTA electrical ground or chassis
to systems with different ground references. Doing so could damage both
systems or create a potential for electrical shock.
J3 harness connections
The J3 harness couples an 18-pin Molex type connector to the J3 connector (see
Figure 26 on page 32). This arrangement provides dedicated termination points
for each digital input, two digital ground, and eight 12 VDC (+) outputs. Common
and specific usage of each termination point is provided in Table 3.