Matrix-orbital LCD2041 Legacy Manuale Utente Scaricare il pdf (Pagina 11)

LCD2041 rev 2

The module is supplied with jumpers J1 and J2 installed, which gives an RS-232 baud rate of 19200 and an

C address of 0x5C.

 RS-232 port: J0, J1, J2 - control baud rate. RS-232 format is 8N1 (8 bits, no parity, one stop bit)

 I²C port: J0, J1, J2, J3 - sets slave peripheral address

Baud Rate Slave Address J3 J2 J1 J0

50H out out out out

1200

52H out out out in

54H out out in out

2400

56H out out in in

58H out in out out

9600

5AH out in out in

5CH out in in out

19200

5EH out in in in

60H in out out out

1200

62H in out out in

64H in out in out

2400

66H in out in in

68H in in out out

9600

6AH in in out in

6CH in in in out

19200

6EH in in in in

2.3 I

C Communications

I²C communications runs at 100 kBps and supports up to 16 units on a single communications line. The

I2C data line operates on 5 volt CMOS levels.

The idea of ACK is to indicate when the data has been received correctly. ACK does not indicate data

incorrectly received. ACK simply fails to indicate when data is correctly received. Clearly, this is of limited

usefulness and even less so with Matrix Orbital modules. Matrix orbital modules are not capable of failing

to acknowledge an incorrectly received byte in response to that bytes transition. They are only capable of

failing to acknowledge the bytes following the byte, which was not received. To fully understand the

reasons for this one needs to understand something about 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 you might be familiar with (i.e. memory chips, etc…)

is that the Matrix Orbital module employs a microprocessor to perform these data storage functions. A

memory chip takes care of these things entirely with in hardware subsystems that operate at the same speed

as the transmission themselves.

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Matrix-orbital LCD2041 Legacy Manuale Utente Pagina 11

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