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4.3.4
USB
The GRA 5500 provides a standard Universal Serial Bus (USB) interface for unit configuration (except for
dual/triple unit strapping), calibration, diagnostics, and software upgrades in non-GIFD (retrofit)
installations. The interface is compatible with the Universal Serial Bus Version 1.1 standard for operation
as a "full-speed" device.
USB VBUS POWER**
USB GROUND**
USB DATA HI**
USB DATA LO**
**Signals have ESD (Electrostatic Discharge) protection, but no lightning protection.
USB Type B Receptacle pigtail cable must be wired directly to P55001.
4.4 Discrete I/O
4.4.1
Active Low Discrete Inputs
The GRA 5500 provides four active-low discrete inputs. Two are used as configuration straps in dual and
triple installations (in both GIFD and non-GIFD/retrofit installations). Two additional inputs are provided
for optional manually-initiated self-test and self-test inhibit operation (discrete inputs used in non-GIFD/
retrofit installations only – manually-initiated self-test and self-test inhibit functionality occurs via HSDB
over RS-422 connections in GIFD installations). See
and manually-initiated self-test capability and operation as well as self-test inhibit functionality. All
active-low discrete inputs conform to the following specifications:
ACTIVE: 0 V ≤ Vin ≤ 3.5 V, or Rin ≤ 375 ohms
INACTIVE: 8 V ≤ Vin ≤ 36 V, or Rin ≥ 100k ohms
Source current is internally limited to approximately 1 mA max for a grounded input.
SELF TEST SELECT*
RADAR ALT SYSTEM ID PROGRAM* 1
RADAR ALT SYSTEM ID PROGRAM* 2
SELF TEST INHIBIT*
*Denotes Active Low (Ground to activate)
190-01277-00
Rev. A
Table 4-7 USB Connections
Pin Name
Section 3.7.4.1
Table 4-8 Active Low Discrete Inputs
Pin Name
Pin
44
45
49
54
for more information on automated
Pin
9
13
14
19
GRA 5500 Installation Manual
I/O
Out
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I/O
I/O
I/O
In
In
In
In
Page 4-5
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