Welcome, Guest. Please Login or Register
Dynon Avionics, Inc.
 
Welcome to the Dynon Avionics forum!


  HomeHelpSearchLoginRegister  
 
 
Page Index Toggle Pages: 1
Send Topic Print
Do I need series resistor on RS-232 line? (Read 714 times)
Jan 21st, 2018 at 7:12pm

Hiroo   Offline
Frequent Poster
I love flying!

Posts: 21
**
 
I remember seeing somewhere that if I am connecting a non-Dynon avionics to RS-232 line, I need to install a series resistor on the RX line on Dynon side.  Did I dream that up?  I cannot find any reference to this on the installation manual but before I let the magic smoke out of my unit, I wanted to check.

Hiroo
 
IP Logged
 
Reply #1 - Jan 22nd, 2018 at 4:03am

jakej   Offline
Expert
Australia

Gender: male
Posts: 1566
*****
 
Maybe you're referring to the inline resistor from a certified Gps (eg Avidyne) to the Dynon Transponder (pin3) RX input ?
 
IP Logged
 
Reply #2 - Jan 22nd, 2018 at 5:31am

Garrett   Offline
Full Member
I love flying!
Tampa Fl

Posts: 177
***
 
It is connected between pin 3 rx on my Dynon SV-261 Transponder and the rs232 ADS-B out on my GTN-650. The installation manual says this must be installed.
 
IP Logged
 
Reply #3 - Jan 22nd, 2018 at 5:37pm

Hiroo   Offline
Frequent Poster
I love flying!

Posts: 21
**
 
I am aware of the manual stating the 1.21K resistor is needed for connecting the SV-261 to GPS unit.  I do not see any similar notation regarding connecting a COM radio (SL40) to the COM port of the IDU.  (The brown / yellow wire with violet and orange stripes).  That is what I am talking about.
 
IP Logged
 
Reply #4 - Jan 22nd, 2018 at 5:55pm

Dynon Avionics   Offline
Dynon Official
Dynon Technical Support

Posts: 12988
*****
 
Yeah, that's the only place in an RS-232 connection where a resistor is used in a SkyView installation.
 

Please do not use Private Messaging on form to contact. For private support:
Email: support at dynonavionics dot com
Phone: 425-402-0433 (7am-5pm Pacific weekdays)
IP Logged
 
Reply #5 - Jan 22nd, 2018 at 9:01pm

Hiroo   Offline
Frequent Poster
I love flying!

Posts: 21
**
 
O.K.  So, to confirm explicitly, I will not fry something by directly connecting SL40's TX line to the RX line in the Dynon HDX IDU.
 
IP Logged
 
Reply #6 - Jan 23rd, 2018 at 2:39am

jakej   Offline
Expert
Australia

Gender: male
Posts: 1566
*****
 
Correct - if you are using one of the HDX serial ports then you are good to go   Wink
 
IP Logged
 
Page Index Toggle Pages: 1
Send Topic Print