[GreenKeys] Hal ST-6 terminal unit question

[Duncan Brown]

Reggie,

The change to the Molex connector was a safety feature so that the loop was isolated from chassis ground and you would not get zapped from the sleeve of a 1/4" connector.

The two "Loops" are in series.  I guess this was to make it easier to hook up two machines. "Loop 1" uses pins 1 & 3; "Loop 2" uses pins 4 & 6.  If you only have one machine (for now) connect it to pins 1 & 3 and then jumper pin 4 to pin 6.

Have fun,

Duncan Brown, K2OEQ
USASA  31J

Chief TTY operator & repairman
AWA Communications Museum
http://www.antiquewireless.org/
http://www.antiquewireless.org/museum/museum.htm




-----Original Message-----
>From: Reggie Moody <moody1951 at bellsouth.net>
>Sent: Jan 17, 2011 10:56 PM
>To: greenkeys at mailman.qth.net
>Subject: [GreenKeys] Hal ST-6 terminal unit question
>
>Have a Hal ST-6 terminal unit with molex connectors on the backside.  I'm a bit 
>confused.  The only manual I have is the one that shows RCA and 1/4 inch plugs 
>for the printer, along with other FSK and etc. It's my understanding this is the 
>manual for an earlier ST-6.  
>
>
>The "loop" connector on my unit is labeled Loop 1 and Loop 2. Pins on the right 
>side of the connector reads 1, 2, 3 and the left side (loop 2) reads 4, 5, 6.
>
>Question. Which of these pins do I tap for the loop current? Question may be 
>elementary, but I'm learning.
>
>Thanks