Embraco Fullmotion CF10C Product Manual page 39

CHAPTER 4. OPERATION
Thermostat TX
Thermostat RX
VCC
Figure 4.4: Electrical schematic of serial communication
To guarantee the correct functionality of serial communication, the signal to be sent
to the inverter must be according to the following values.
Signal specifications
Voltage range
TRUE state
FALSE state
Maximum current
Start
bit
FALSE
The identification byte (1st byte), is used for command synchronization. Aſter in-
verter identifies a valid A5h, it starts to read the next 4 bytes. Aſter reading, a re-
CN 203 pinout:
PIN 1 – Signal from Thermostat
PIN 2 – Thermostat GND
Inverter board
CN 204
1
1
2
2
3
3
CN 204 pinout:
PIN 1 – Signal from Thermostat
PIN 2 – Thermostat GND
PIN 3 – Signal toThermostat
-5 V to +15 V
-5 V to +0.7 V
+4.5 V to +15 V
2 mA @ 15 V
Example: 39h sent to inverter
0 1 2
TRUE FALSE FALSE
Collector current
range: 1 mA to 2 mA
15V
4.5V
0.7V
-5V
Data bits
3 4 5
TRUE TRUE TRUE FALSE
Time
VCC
Inverter TX
VCC
Inverter RX
FALSE state
Indefinite state
TRUE state
Stop
6 7
bit
FALSE TRUE
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