[GreenKeys] DTE & DCE on a modem

[gil smith]

Hi Larry:

One has TX on pin two and RX on pin three, the other one is the opposite -- 
don't recall which is which at the moment.  Ground is on pin seven (this is 
a DB-25).  You may or may not have to provide handshake lines (RTS/CTS, 
DTR/DSR), or pull them to the appropriate levels.

I know that's all pretty non-specific, but I don't have reference docs 
handy right now.  Should be able to google DTE and DCE and find the pinout 
of these two DB-25 connectors.  The connector sex is probably different as 
well, so you know which is which, and can then run a straight-wired cable 
between them.

gil




At 02:28 PM 5/21/2008, Larry Tighe wrote:
>Howdy Folks,
>
>Got my hands on some Black Box CL050A modems.  Planning to try keying a HV 
>transistor with the RS-232 outputs.  They are designed to key a current 
>loop which they supply 18 volts to.
>
>Can anyone tell me what DCE and DTE means?  There are dip switches that'll 
>have to be set up....
>
>Thanks,
>Larry
>www.antiquetelephone.com
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