___________________________________________________________
Page 4-16
GNS 400W Series Maintenance Manual
Rev. A
190-00356-05
For:
INPUT NAME
PIN
ALTITUDE C4
(J1-61)
ALTITUDE C2
(J1-62)
ALTITUDE C1
(J1-63)
ALTITUDE B4
(J1-64)
ALTITUDE B2
(J1-65)
ALTITUDE B1
(J1-66)
ALTITUDE A4
(J1-67)
ALTITUDE A2
(J1-68)
ALTITUDE A1
(J1-69)
ALTITUDE D4
(J1-70)
OBS MODE SELECT
(J1-71)
SPARE INPUT B
(J1-72)
CDI SOURCE SELECT
(J1-73)
COMM REMOTE
RECALL
(J1-74)
DEMO MODE SELECT
(J1-75)
TEST MODE SELECT
(J1-76)
Apply alternating loads/levels to inputs. Monitor the test results via the main discrete inputs page
(Figure 4-8).
< 375 ohm to GROUND
> 100 k ohm to GROUND
ACTIVE INACTIVE
ARINC 429 Transmitter and Receivers
Figure 4-8. Main ARINC 429 Page (Configuration Page)
The transmitter lines A and B of the ARINC 429 channel must meet the requirements of ARINC
429 with the exception that only five receiver loads are to be driven. The transmitter is capable of
both low and high speed operation. The frequency of transmission must be 14.29 ± 0.1 kHz for
low speed and 100.0 ± 0.1 kHz for high speed. The differential output voltage from line A to line
B must be not less than 9.0 volts or greater than 11.0 volts.
The ARINC 429 receivers must be able to receive differential voltages between line A and line B
of not less than 6.5 volts or greater than 13.0 volts. A differential voltage of less than 2.5 volts
