Curtiss-Wright SSR/CHS/001, Manual, Page: 7 / 24

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24 Nov. 2020 | DST/AE/022
CURTISSWRIGHTDS.COM
SSR/CHS/001
TABLE 10 Battery-backed real-time clock
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Drift Determined by the temperature compensated crystal
oscillator (TCXO) in controller.
on – – 3 ppm
off – – 100 ppm
Battery duration – – 4 years Expiry date is labeled on battery mount.
TABLE 11 RS-422 inputs
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Inputs – – 2 –
Signaling rate
STA – – 0.5 Hz When START_STOP is logic 1, packets are recorded; when
logic 0, no packets are recorded.
START_STOP- – – 0.5 Hz
EVENT+ – – 0.5 Hz Event is triggered when signal changes from logic 1 to logic 0
or from logic 0 to logic 1.
EVENT- – – 0.5 Hz
Input voltage
operating range -7 – 12 V Do not exceed operating range.
logic 0 – – -0.2 V V
IN+
- V
IN-
.
logic 1 0.2 – – V V
IN+
- V
IN-
.
overvoltage protection -27 – 27 V Voltages outside of this range can damage input.
ESD protection -15 – 15 kV Human Body Model.
Input resistance
between inputs – 120 – Ω Module powered on.
between inputs – 120 – Ω Module powered off.
each input to GND – 300 – kΩ Module powered on.
each input to GND – 80 – kΩ Module powered off.
TABLE 12 RS-422 outputs
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Outputs – – 1 –
Signaling rate
PPS+ – – 1 Hz
PPS- – – 1 Hz Pulse per second output.