Page 4-6 GTX 330/GTX 330D Installation Manual
Revision R 190-00207-02
4.4.3 Altimeter Interconnect, Dual GTX 330 Installation
A dual GTX 330 installation can accept either parallel wire gray code altimeter input or RS-232 serial
data input as shown in Figure 4-2. If transponder number 2 is a Garmin GTX 327, connect the RS-232
output from the altitude encoder to J3271 pin 19 (refer to GTX 327 Transponder Installation Manual,
P/N 190-00187-02).
Refer to Figure C-9, Sheet 1 for dual GTX 330 gray code altimeter interconnections. Refer to Figure C-9,
Sheets 2 and 3 for dual altimeter interconnections to a GNS 480 (CNX80). The GNS 480 (CNX80) can
receive digital data from only one transponder at a time. Due to system configuration, dual transponders
must be identical, i.e. dual GTX 330s, in a system with one GNS 480 (CNX80).
P3301
P3301
Figure 4-2. Dual GTX 330, Single Encoder, Serial Input Connections
For complete dual installations containing two encoders, it is best to connect one encoder to each
transponder.
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