Table 2 Read Status
BIT d1 d2 d3
b.7 = 1 RTD1 Open Fault RTD2 Open Fault High Fixed Temp Fault
b.6 = 1 RTD1 Shorted Fault RTD2 Shorted Fault Low Fixed Temp Fault
b.5 = 1 RTD1 Open RTD2 Open Warn High Temp Fault
b.4 = 1 RTD1 Shorted RTD2 Shorted Warn Low Temp Fault
b.3 = 1 RTD3 Open Fault RTD2 Open Low Level Fault
b.2 = 1 RTD3 Shorted Fault RTD2 Shorted High Temp Warn
b.1 = 1 RTD3 Open Refrig High Temp Low Temp Warn
b.0 = 1 RTD3 Shorted HTC Fault Low Level Warn
BIT d4 d5
b.7 = 1 Buzzer On RTD2 Controlling
b.6 = 1 Alarm Muted Heat LED Flashing**
b.5 = 1 Unit Faulted Heat LED On**
b.4 = 1 Unit Stopping Cool LED Flashing**
b.3 = 1 Unit On Col LED On**
b.2 = 1 Pump On 0
b.1 = 1 Compressor On 0
b.0 = 1 Heater On 0
**LED bits in REQ STATUS1 byte d5
LED State LED Flashing LED On
OFF 0 0
ON 0 1
FLASHING 1 1
Invalid 1 0
b.7 = most significan bit
b.0 = least signifcant bit
Table 3 Qualifier Byte
10 hex 0.1 precision, no units of measure
20 hex 0.01 precision, no units of measure
11 hex 0.1 precision, °C units
21 hex 0.01 precision, °C units
Example: The temperature of 45.6 °C would be represented by the qualifier 11 hex, followed by the 2 bytes 01
C8 hex (456 decimal).
Appendix B
B - 5
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