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Old 02-28-2018, 12:47 PM
stneki stneki is offline
Join Date: Feb 2006
Location: Spring Lake, MI
Posts: 164
Default GRT and ACK E-04 ELT

I am trying to use the internal gps on my HS Sport to feed gps data to a ACK E-04 ELT with no luck. I fabricated the test tool specified in the instructions for ACK and I am not get any light or flashing with the test tool. I have port 3 set for 4800 baud and the serial wire is connected to pin number 32 of the HS Sport. I installed the jumber on the curcuit board in the ELT for the 4800 baud rate. I did connect a volt meter to the serial data in pin on he plug that connects to the ELT and to the ground. The volt meter jumps from around -5 volts to positive volts. Any ideas on what to try or check next?
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Old 02-28-2018, 01:27 PM
Bevan Bevan is offline
Join Date: Sep 2007
Location: BC
Posts: 1,707

It could be that the GRT is outputting 9600 Baud.

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Old 02-28-2018, 02:20 PM
12vaitor 12vaitor is offline
Join Date: Aug 2012
Location: Panama City, FL
Posts: 178

You could have the wrong data format set, in addition to the baud rate make sure you are using a source set to 8 data, 1 stop, and no parity bits. NMEA 0183 is normal message format expected, some "232 Aviation out" formats also work.

For the ACK manual:
No GPS data is being received, the ELT test light does not flash, or LED stays on: Check that the data being sent to the ELT meets the data protocol in Section 17 of this manual. Connect test LED to pin 4 and ground of the cable providing GPS data and power (page 8 Fig 13), test light should flash. If not, reverse test LED and if flashing retry test lead on ELT.

John Salak
RV-12 N896HS
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