Re: What is the left most 9 pin port on a TP750Ce (lost the manual)

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From: Robert George (george_at_cs.nps.navy.mil)
Date: Tue Nov 08 1994 - 16:55:52 EST

> I am trying to connect the TP to a HP200LX via a 9-pin cable.
> What is the 9-pin port on the TP750?

The ThinkPad uses a standard RS-232D interface which is compatible with the
16550 UART. The pinouts for the male DB9 is:

    Pin Name Description
    --- ---- -----------
     1 DCD Carrier Detect
     2 RD Receive Data
     3 TD Transmit Data
     4 DTR Data Terminal Ready
     5 SG Signal Ground
     6 DSR Data Set Ready
     7 RTS Request to Send
     8 CTS Clear to Send
     9 RI Ring Indicator

For a minimal interface to the HP, you probably only need 2,3 & 5.

If the HP needs hardware flow control, then 2,3,5,7 & 8.

 

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