[volt-nuts] How to wire a serial cable for a Solartron 7151

David C. Partridge david.partridge at perdrix.co.uk
Sat Apr 14 17:19:58 UTC 2012

Hmmmm I may be getting somewhere. but not quite sure where.

I swapped Tx and Rx, RTS and CTS so I had a very basic null-modem connection.

With the DIP switches set for 9600 baud, Space Parity and 2 stop bits.

I set Hyperterminal up for 9600,8,S,2 

When I connect I now get output from the meter, but it is garbage.


If I set hyperterminal to any other settings I get nothing at all.

This almost sounds like the problem that people who use TTL serial have with inverted logic levels.

The problem is identical if I try with another 7151.

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On Behalf Of David C. Partridge
Sent: 14 April 2012 14:24
To: 'Discussion of precise voltage measurement'
Subject: [volt-nuts] How to wire a serial cable for a Solartron 7151

I'm trying to communicate with a Solartron 7151 using RS232 and failing.

I've made up a cable DB9 to DB15 wired straight through based on the information on page 6.6 of the user manual which shows the pin assignments of the DB15 connector on the back of the DMM.

DB9 Pin 1 DCD not connected
DB9 Pin 2 RxD to DB15 Pin 3
DB9 Pin 3 TxD to DB15 Pin 2
DB9 Pin 4 DTR to DB15 Pin 15
DB9 Pin 5 GND to DB15 Pin 7
DB9 Pin 6 DSR not connected
DB9 Pin 7 RTS to DB15 Pin 4
DB9 Pin 8 CTS to DB15 Pin 5
DB9 Pin 9 RI  not connected

I didn't connect DB15 Pin 10 to anything, as there is nothing on a DB9 that provides Receive Clock - all my serial ports are DB9.

Unfortunately it doesn't work.

If anyone knows how it should be wired, please could they let me know?


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