User`s guide

150
Chapter 4 Features and Functions
Alarm Limits
Example: Configuring an Alarm on a Digital Input
Assume that you want to generate an alarm when a binary pattern of
“1000” is read on the upper four bits of port 1. Send the following
commands to configure the port for an alarm.
CALC:COMP:TYPE EQUAL,(@301)
CALC:COMP:DATA 128,(@301)
CALC:COMP:MASK 240,(@301)
OUTPUT:ALARM2:SOURCE (@301)
CALC:COMP:STATE ON,(@301)
Here are the calculations used to evaluate the alarm (assume that a
decimal 146 was read from the port):
Since the calculations produce a non-zero result (decimal 16), an
alarm is not generated in this example.
• Remote Interface Operation (Totalizer Channel): To assign the alarm
number to report any alarm conditions on the specified totalizer
channels, use the following command.
OUTPut:ALARm[1|2|3|4]:SOURce (@<ch_list>)
To configure an alarm on a totalizer channel, specify the desired
count as the upper limit using the following command.
CALCulate:LIMit:UPPer <count>[,(@<ch_list>)]
To enable the upper limit on the specified totalizer channel, use the
following command.
CALCulate:LIMit:UPPer:STATe ON [,(@<ch_list>)]
ABX-OR
0
0
1
1
0
1
0
1
0
1
1
0
ABAND
0
0
1
1
0
1
0
1
0
0
0
1
1 0 0 1 0 0 1 0
1 0 0 0 0 0 0 0
0 0 0 1 0 0 1 0
1 1 1 1 0 0 0 0
0 0 0 1 0 0 0 0
Bit 7 Bit 0
Data read from port (decimal 146)
CALC:COMP:DATA command (decimal 128)
“X-OR” result
CALC:COMP:MASK command (decimal 240)
“AND” result (no alarm generated)
34970A Refresh UG.book Page 150 Wednesday, February 17, 2010 12:34 PM