
Date Code 20000525
SEL-2600 RTD Module
SEL-2030 Communications Processor Applications
9
Line 3: Subtracts the measured RTD temperature from the threshold and
stores the result in register 034h. If the result is negative, the mea-
sured RTD temperature is above the threshold and Bit 15 (the sign
bit) of 034h is set.
Line 4: Copies the sign bit (Bit 15) of 034h into Bit 0 of 035h.
Line 5: Clears Bit 0 of 35h if RTD is shorted.
Line 6: Clears Bit 0 of 35h if RTD is open.
Table 2
SEL-2030 Communications Processor Memory Map
This logic can be expanded to operate on additional RTDs. Use the SET A
command to reserve additional registers for mathematical equations.
SET A USER 4
USER = 57
Table 2
SEL-2030 Communications Processor Memory Map
Address (hex)
Offset
Data Description
F800h–F801h 0–01h Milliseconds since device power-up
F802h 02h Device
status
F803h
03h
RTD 1, 100-ohm platinum
F804h
04h
RTD 1, 100-ohm nickel
F805h
05h
RTD 1, 120-ohm nickel
F806h
06h
RTD 1, 10-ohm copper
F807h
07h
RTD 2, 100-ohm platinum
F808h
08h
RTD 2, 100-ohm nickel
F809h
09h
RTD 2, 120-ohm nickel
F80Ah
0Ah
RTD 2, 10-ohm copper
•
•
(this 4-register sequence is repeated for RTD 3 through RTD11)
•
•
F82Fh
2Fh
RTD 12, 100-ohm platinum
F830h
30h
RTD 12, 100-ohm nickel
F831h
31h
RTD 12, 120-ohm nickel
F832h
32h
RTD 12, 10-ohm copper
F833h–F835h 33h–35h
Storage for mathematical functions