Garmin GMU 44, Руководство по установке

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G300 Installation Manual – Pinouts Page A-13
190-00921-01 Revision A
A.3.6.2 Discrete Outputs
DISCRETE OUT pins:
INACTIVE: Floating (can be pulled up to externally sourced Vout in the range 0
≤  Vout ≤  33VDC)
Leakage current in the INACTIVE state is typically ≤ 10 uA to ground
ACTIVE: Vout ≤ 0.5VDC with ≤  20 mA sink current
Sink current must be externally limited to 20 mA max
Pin Connector Pin Name I/O
13 P731 DISCRETE OUT* 1 OUT
14 P731 DISCRETE OUT* 2 OUT
* Indicates Active Low
A.3.7 Analog Input Configuration
Some analog inputs are multi-purpose capable and have several configuration options. These inputs are
configured automatically at power on by a configuration file stored in the G300. The following table
summarizes the configuration options.
Configurable Parameter Description/Characteristic
Resistive Divider Resistive Divider can be enabled or disabled for Analog Input
channels 14-25. Enabling & Disabling is achieved via software
configuration.
When Disabled : Hardware scaling is 1:1 and input impedance is
greater than 10 M
Ω
.
When Enabled : Hardware scaling is approximately 45:1 and input
impedance is approximately 100 k
Ω
.
Voltage Measurement Ranges There are six voltage measurement ranges for analog inputs:
•
25 mV, 55 mV, 100 mV, 1.0 Vdc, 2.5 Vdc, and 5.0 Vdc
(Applies to both 1:1 and 45:1 scaling).
Effective voltage range in 45:1 mode:
•
1.125 Vdc, 2.475 Vdc, 4.5 Vdc, and 45 Vdc.
Bipolar/Unipolar Each analog input can be configured to measure Bi-Polar (positive
and negative) or Uni-Polar (positive only) voltages. All analog inputs
are differential.
Constant Current Source Analog Input channels 12, 13, 22, 23, 24, & 25 can be configured to
supply a 250
µ
A constant current source (CCS) from the positive
differential input used to measure resistive sensors. The negative
(LO) side of a CCS configured input must be tied to unit ground to
provide a current path to ground.
Miscellaneous Sensor
Configuration Parameters
•
Update Rate
•
Voltage Translation Equations
•
Minimum/Maximum Values for Sensors
•
Hysteresis Value
•
Digital Filtering Value