Mitsubishi Electric CITY MULTI CMB-P1016V-F, Service Handbook

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(2) MA remote control transmission
The MA remote control and indoor unit communicate with the current tone burst method.
If noise, etc., infiltrates the transmission cable and the communication between the MA remote control and indoor
unit is cut off for three consecutive minutes, a MA communication error (6831) will occur.
1) Symptoms caused by infiltration of noise on transmission cable
A1, B2: No polarity
Across terminal No. 1-2 ... Power
supply (9V to 12VDC)
12msec/bit+5% must be satisfied
Voltage across terminal No.1-2 must
be within range shown on left.
2) Confirmation of transmission specifications and waveform
1
2
MA remote controller
Transmission waveform (Across terminal No. 1-2)
Logical 1 Logical 0 Logical 1 Logical 1
Indoor unit
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