Garmin International Inc 0181200 Manuel D’Utilisation
190-01277-00
GRA 5500 Installation Manual
Rev. A
Page 4-5
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
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
.
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
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
for more information on automated
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-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.
Table 4-7 USB Connections
Pin Name
Pin
I/O
USB VBUS POWER**
44
Out
USB GROUND**
45
--
USB DATA HI**
49
I/O
USB DATA LO**
54
I/O
**Signals have ESD (Electrostatic Discharge) protection, but no lightning protection.
USB Type B Receptacle pigtail cable must be wired directly to P55001.
USB Type B Receptacle pigtail cable must be wired directly to P55001.
Table 4-8 Active Low Discrete Inputs
Pin Name
Pin
I/O
SELF TEST SELECT*
9
In
RADAR ALT SYSTEM ID PROGRAM* 1
13
In
RADAR ALT SYSTEM ID PROGRAM* 2
14
In
SELF TEST INHIBIT*
19
In
*Denotes Active Low (Ground to activate)
DRAFT