![background image](http://html1.mh-extra.com/html/keithley/3700-series/3700-series_user-manual_3935064185.webp)
Section 6: Model 3750 Additional Information
Series 3700 System Switch/Multimeter User's Manual
6-6
3700S-900-01 Rev. C / July 2008
To read and write banks using a scan
Any input bank or totalizer channel that is included in a scan list is read when
that channel is scanned. The value is saved to the buffer specified for the scan.
For digital inputs, the width defaults to 1. For totalizers, the full count is read. For
example, to read totalizer 1 on card 2 after scanning all channels of a Slot 1
multiplexer, use the
scan.create()
command:
scan.create('1001:1060, 2006')
To read more than one bank at a time, the
width
needs to be specified with the
scan.add()
command. For example, to read 32 bits of digital input on Slot 2
after scanning 60 channels on Slot 1:
scan.create('1001:1060')
scan.add('2001', 4)
To write to either a digital output or an analog channel, use the
scan.addwrite()
command, which includes a parameter for the data value to
be written and an optional width parameter. For example, to program DAC
Channel 1 on the Slot 2 card to go to +5 V after scanning 60 channels on Slot 1:
scan.create('1001:1060')
scan.addwrite('2010', '5')
Power consumption information
You can power off the totalizers if they are not being used, which reduces the
power required of the card. The card has a default static power draw of
3300 mW, which includes powering the totalizer channels and both analog
output channels. If the totalizer channels are powered off, they reduce the
3300 mW draw by 730 mW. This power can then be used for closing relays on
other cards within the bank. See
Series 3700 Module Schematics and
Connections
(on page 9-1) for more information on power handling information
and examples.
NOTE
The four totalizers are either all powered on or all powered off.
Changing the power state of one affects them all. The command for
controlling power is
channel.setpowerstate(<ch_list>,
<state>)
, where
<state>
is either
'channel.ON'
or
'channel.OFF'
. See
channel.setpowerstate()
for more
information.