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SL70 transponder & Grand Rapids EFIS

 
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Jerry Cochran



Joined: 10 Jan 2006
Posts: 111
Location: Wilsonville, OR

PostPosted: Sun Mar 12, 2006 3:56 pm    Post subject: SL70 transponder & Grand Rapids EFIS Reply with quote

Listers,

I'm installing a UPSAT SL70 transponder with RS232 input from GRT EFIS. The
SL70 wants a two-wire shielded cable with shield attached to chassis of both.
One inner wire is "RxD serial input", while the other is "RS232 serial ground
out" The EFIS doesn't appear to have a pin for this, or should I just tie
into a common ground. This doesn't look right since the SL70 is grounded
anyway. I am puzzled....

Jerry Cochran


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brian



Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

PostPosted: Sun Mar 12, 2006 9:42 pm    Post subject: SL70 transponder & Grand Rapids EFIS Reply with quote

Jerry2DT(at)aol.com wrote:

Quote:
I'm installing a UPSAT SL70 transponder with RS232 input from GRT EFIS. The
SL70 wants a two-wire shielded cable with shield attached to chassis of both.

Attach the shield at only one end. It is just a shield, not a ground or
return line.

Quote:
One inner wire is "RxD serial input", while the other is "RS232 serial ground
out" The EFIS doesn't appear to have a pin for this, or should I just tie
into a common ground. This doesn't look right since the SL70 is grounded
anyway. I am puzzled....

Tie the "RS-232 ground out" on the SL70 to ground on the EFIS. Connect
the RS-232 data terminal on the SL70 to the RS-232 out on the EFIS. It
may be that the RS-232 input on the SL70 has its own floating ground
(perhaps opto-isolated) in order to eliminate ground loops.

--
Brian Lloyd 361 Catterline Way
brian-yak at lloyd dot com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery


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Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery
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