(3)Investigation of transmission wave shape/noise

Control is performed by exchanging signals between outdoor unit, indoor unit and remote controller by M-NET transmission. If noise should enter into the transmission line, the normal transmission will be hindered causing erroneous operation.

1)Symptom caused by the noise entered into transmission line

Cause

Erroneous operation

Error code

 

 

 

Noise entered into

Signal changes and is misjudged as the signal of other

6600

transmission line

address.

 

 

 

 

 

Transmission wave shape changes to other signal due to

6602

 

noise.

 

 

 

 

 

Transmission wave shape changes due to noise, and can

6607

 

not be received normally thus providing no reply (ACK).

 

 

 

 

 

Transmission can not be made continuously due to the

6603

 

entry of fine noise.

 

 

 

 

 

Transmission can be made normally, but reply (ACK) or

6607

 

answer can not be issued normally due to noise.

6608

 

 

 

2)Method to confirm wave shape

No fine noise allowed *1

VHL

 

 

 

<with transmission>

VBN

 

 

 

 

 

 

 

 

 

 

52 ∝ s 52 ∝ s 52 ∝ s

52 ∝ s 52 ∝ s

Logical value “0” Logical

value “1”

No fine noise allowed *1

<without transmission>

Check the wave shape of transmission line with an oscilloscope to confirm that the following conditions are being satisfied.

1The figure should be 104∝ s/bit ± 1%.

2No finer wave shape (noise) than the transmission signal (52∝ s ± 1%) should be allowed. *1

3The sectional voltage level of transmission signal should be as follows.

Logic value Transmission line voltage level

0VHL = 2.0V or more

1VBN = 1.3V or less

*1 However, minute noise from the DC-DC converter or inverter operation may be picked up.

–83–

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Mitsubishi Electronics PURY-P400, P500YMF-C specifications Investigation of transmission wave shape/noise
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PURY-P400, P500YMF-C specifications

Mitsubishi Electronics has long been a leader in the HVAC industry, known for its innovative technology and reliable performance. Among its notable offerings are the P500YMF-C and PURY-P400 models, designed to address the diverse needs of commercial and residential applications.

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