OCIO Inputs Each channel has a 10KΩ pull-up resistor to +12VDC, connected
in series with a current limiting diode. Inputs are sensed with a
74AC14 CMOS gate. Input logic thresholds are:
V
IH
min: 3.5 V
V
IL
max: 1.0 V
OCIO Outputs The OCIO output channel is a current-sinking (open drain)
DMOS transistor. The power-on output state is off. Outputs are
voltage clamped for inductive transient protection. The output
transistor specifications are:
V
o
max: 50 V
I
o
max: 100ma
r
ds
(on): 5Ω - typical @ 100 ma, 25°C
9.5Ω - maximum @ 100 ma, 125°C
OCIO +5VDC A +5V DC supply resides on the SC900. This supply is
connected to J52-25, as well as J51-4 (serial port), and J4-25
(command port on base unit). The total current draw from all
connections must not exceed 200 milliamperes.
3-16 MA950
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