User`s manual

38 Using the Relay Multiplexer Modules Chapter 3
Example: Making 2-Wire
Ohms Measurements by
Scanning
Use the same setup shown in the first program example in this section,
except change the commands in lines 10 and 40 to the following:
10 OUTPUT 722;"TRIG EXT;OHM"
!Set multimeter to 2-wire ohms.
40 OUTPUT 70914;"SCAN:MODE RES"
!Closes channel switches.
This command, when used with SCAN:PORT ABUS and
SCAN <channel_list> commands, automatically closes the channels defined
in the channel list, and the AT and AT2 Tree Switches during scanning.
Example: Making 4-Wire
Ohms Measurements by
Scanning
Use the SCAN:MODE FRES command to automatically close the selected
channels defined in the
SCAN <channel_list> command. This type of
measurement requires paired channel closure (e.g., channels 02 and 10),
which the command automatically performs. Change the commands in lines
10 and 40 to the following:
10 OUTPUT 722;"TRIG EXT;OHM"
!Set multimeter to 4-wire ohms.
40 OUTPUT 70914;"SCAN:MODE FRES"
!Closes channel switches.
This command, when used with the SCAN:PORT ABUS and
SCAN <channel_list> commands, automatically closes the channels defined
in the channel list and the AT and BT Tree Switches during scanning.
Example: Making
Multiple Scans
The ARM:COUN <number> command selects multiple scanning cycles. Add
the command to the first program example in this section, as follows:
OUTPUT 70914;"ARM:COUN 10"
!Enables 10 scanning cycles.
OUTPUT 70914;"SCAN (@100:215)"
!Sets scan list.
Example: Making
Continuous Scans
The INIT:CONT ON command selects continuous scanning cycles
(
INIT:CONT OFF disables continuous scanning cycles). Add the command
to the first program example in this section, as follows:
OUTPUT 70914;"INIT:CONT ON"
!Enables continuous scanning
cycles.
OUTPUT 70914;"SCAN (@100:215)"
!Sets scan list.
Comments See Chapter 4 for more information on scanning.
Scanning Requirements of a Switchbox (in an Mainframe with an
Command Module). To scan modules in a switchbox, you must:
-- know the card numbers (see Chapter 1) of all the modules to be
scanned;
-- sequentially address the modules (e.g., Logical Address 112, 113,
114, etc.);
-- set lowest addressed module to a logical address that is a multiple of
8 (see the 75000 Series B Installation and Getting Started Guide, or
other appropriate manuals, for more information).