IOtech MultiScan 1200, User Manual

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TempScan / MultiScan User's Manual Chapter 14: System Calibration 235
4. Send the following Calibrate Cold Junction Offset (
J
) command
Jchan,type,temp
for the first
cold-junction channel (temperature sensor #1):
•
TempTC/32B (for TempScan/1100):
Jchan,type,nnn.n
•
TempTC/32A (for TempScan/1000A):
Jchan,type,nnn.n
•
MTC/24 (for MultiScan/1200):
Jchan,type,nnn.n
Wait for the command to complete. The TRIGGER LED indicator will flash for a few seconds.
Monitor the Calibration Status Register (
CSR
) to ensure that the Calibrate Cold Junction Offset (
J
)
command completed without error. Refer to the User Status (
U
) command
U2
to monitor and
decode the Calibration Status Register (
CSR
).
5. Next, send the following Calibrate Cold Junction Offset (
J
) command
Jchan,type,temp
for the
second cold-junction channel (temperature sensor #2):
•
TempTC/32B (for TempScan/1100):
Jchan+4,type,ppp.p
•
TempTC/32A (for TempScan/1000A):
Jchan+4,type,ppp.p
•
MTC/24 (for MultiScan/1200):
Jchan+8,type,ppp.p
Wait for the command to complete. The TRIGGER LED indicator will flash for a few seconds.
Monitor the Calibration Status Register (
CSR
) to ensure that the Calibrate Cold Junction Offset (
J
)
command completed without error. Refer to the User Status (
U
) command
U2
to monitor and
decode the Calibration Status Register (
CSR
).
6. Next, send the following Calibrate Cold Junction Offset (
J
) command
Jchan,type,temp
for the
third cold-junction channel (temperature sensor #3):
•
TempTC/32B (for TempScan/1100):
Jchan+16,type,qqq.q
•
TempTC/32A (for TempScan/1000A):
Jchan+16,type,qqq.q
•
MTC/24 (for MultiScan/1200):
Jchan+16,type,qqq.q
Wait for the command to complete. The TRIGGER LED indicator will flash for a few seconds.
Monitor the Calibration Status Register (
CSR
) to ensure that the Calibrate Cold Junction Offset (
J
)
command completed without error. Refer to the User Status (
U
) command
U2
to monitor and
decode the Calibration Status Register (
CSR
).
7. At this point, the 3 cold-junction channels of the MTC/24 (for MultiScan/1200) scanning card
have been calibrated. This additional Step applies only to the fourth cold-junction channel of the
TempTC/32B (for TempScan/1100) and TempTC/32A (for TempScan/1000A) scanning cards.
Finally, send the following Calibrate Cold Junction Offset (
J
) command
Jchan,type,temp
for
the fourth cold-junction channel (temperature sensor #4):
•
TempTC/32B (for TempScan/1100):
Jchan+20,type,rrr.r
•
TempTC/32A (for TempScan/1000A):
Jchan+20,type,rrr.r
Wait for the command to complete. The TRIGGER LED indicator will flash for a few seconds.
Monitor the Calibration Status Register (
CSR
) to ensure that the Calibrate Cold Junction Offset (
J
)
command completed without error. Refer to the User Status (
U
) command
U2
to monitor and
decode the Calibration Status Register (
CSR
).