IOtech MultiScan 1200, User Manual

Page: 265 / 364

TempScan / MultiScan User's Manual Chapter 15: Program Examples 255
The following program is
ALARM2.BAS
in the
\EXAMPLES\
subdirectory. It will set up the alarm
system of the MultiScan/1200.
•
Lines 1-3: Although not necessary, it is good practice to reset the MultiScan/1200 at the start of
your application by sending the Reset Power-On (
*R
) command. Wait a few seconds.
•
Lines 4-8: To be certain that the reset was successful and the device is ready, Serial Poll the device
until the proper status is returned.
•
Lines 9-10: The first thing necessary to start scanning is to setup the measuring mode. In this case,
the MultiScan/1200 will be setup for line-cycle integration / high-speed multi-channel mode.
•
Line 11: The Configure Channels (
C
) command will be used once to configure a range of channels
from 1 to 24 as Type T thermocouples, where levels above 18 or below 1 will cause a system
alarm.
•
Line 12: In addition to causing an internal system alarm state, the alarm conditions can also be
attached to any one of the 32 digital output lines. The Assign Digital Alarm Output (
A
) command
will be used to assign input Channels 1 and 2 to digital alarm Output 1 in an OR ed fashion.
•
Lines 13-14: Program for one Pre-Trigger scan via the Set Counts (
Y
) command. Then program
the Trigger (trigger start event) and Stop (trigger stop event) via the Set Trigger Configuration (
T
)
command to arm the acquisition.
•
Lines 15-36: The Set Digital Outputs (
O
) command
O?
will be used to query the status of the
digital output lines. The alarm state can be detected since digital alarm Output 1 was mapped into
input Channels 1 and 2. This example shows alarm detection handling when two or more channels
have to be muxed into one single digital output bit.
The User Status (
U
) command
U11
will be used to show each individual channel alarm status.