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

[george@cs.nps.navy.mil (Robert George)]

> 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.

 

| Robert George            |  Army Research Laboratory              |
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