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

[m k]

Hi Dave,

Two more thoughts, could it be that the PC serial is not driving to legal RS232 Volts, put a scope on and look at all the signals.

OR it could be a problem that bit me a few years ago, I had some kit that was RS232 and then the replacement PC did not come with a seriaal port. I had to buy an USB to serial adaptor, but it didnt work, some forum hunting found a model that was more reliable.

MK

> From: david.partridge at perdrix.co.uk
> To: volt-nuts at febo.com
> Date: Sat, 14 Apr 2012 18:19:58 +0100
> Subject: Re: [volt-nuts] How to wire a serial cable for a Solartron 7151
> 
> 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.
> 
> Knpxpywpp`@6`
> knpxtwvyp@`@
> KNpxxtvtp``6@
> kNpyrpqtp@`6@
> kNpyututp@`@
> KNpyypvup`@6`
> KNqpruuyp`@6`
> kNqpvpwwp``6@
> 
> 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.
> 
> Dave
> -----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?
> 
> Thanks
> Dave
> 
> 
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