Matrix Orbital VK162-12 Legacy User Manual

Page 15

for this, one needs to understand how a Matrix Orbital module processes data. Basically, the reason why a

Matrix Orbital module might fail to receive a byte correctly is that it was unable to process the byte previous

before the failed byte was transmitted. Because the module cannot possibly know that it would be unable to

store the byte before the next byte was received it cannot know to not ACK. The reason for this situation in

deference to situations one might be familiar with (i.e., memory chips, etc) is that the Matrix Orbital module

employs a micro-processor to perform these data storage functions. A memory chip takes care of these

things entirely within hardware subsystems which operate at the same speed as the transmission themselves.

The display uses a standard Phillips 7bit address as defined by Phillips. However, Matrix Orbital specifies

C address in 8bits. The 8th bit, least significant bit, LSB or Low Order Bit of the 8bit address is a read

/ write bit. If we take a standard Phillips 7bit address of 45hex this would be in binary 1000101. This is

7bits. Matrix Orbital would describe the Phillips I

C address of 45hex as 8Ahex. The read address would

be 8Bhex.

For more information on Phillips I

C please visit;

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and for more information specific to our displays visit;

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To communicate by I

C two jumpers have to be set into the I

C position left of the power SIP connector.

The I

C setting is default on the display.

Figure 14: RS-232 SIPs

Connector pinout is as follows;

Figure 15: Power Connector

Matrix Orbital

VK162-12