HP OpenVMS Systems

problems with serial line connection? (modems)

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The Question is:

 
Point to Point Modem Connection
 
I am trying to connect a terminal to a DECserver 90 or 900 using RAD Async
Multipoint Short Range Modems.  The setup is as follows
 
TERMINAL--modem---line------modem--V.24--Server
 
 
  I am running into trouble making a cable that will work.  The connection
on the back of the modem is an RJ45 (V.24).
 
The card has a DCE/DTE switch.  The following pinouts are displayed in the
manual.
 
DCE Position
 
TD---XMT pair
RD---RCV pair
RTS-|
    |
CTS-|
DSR---+V
DCD---+V
DTR
 
DTE Position
 
TD---RCV pair
RD---XMT pair
RTS---+V
CTS
DSR
DCD
DTR---+V
 
as well the RJ45 connection DTE(V.24) pinouts are as follows:
 
1.   Chassis Ground
2.   RTS
3.   RXD
4.   DCD
5.   TXD
6.   DTR
7.   SIG. GND
8.   CTS
 
 
What pin connections have to be made to communicate with a DECserver?
 

The Answer is :

 
  Please acquire a serial line breakout box, and use it to see exactly what
  is going on here.
 
  Various pinouts are included in the OpenVMS FAQ and elsewhere, including
  pointers and discussions here.

  

     

     
answer written or last revised on ( 19-OCT-1998 )
     
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