Matrix-orbital LK202-24-USB Manual de usuario descargar pdf (Pagina 25)

protocol is used for reading fan speeds and retrieving 1-wire bus information. The basic structure of the

protocol is described in the Table below.

Table 9: Display Return Protocol

Offset

(Bytes)

Length

(Bytes)

Value Description

0 2 0x23 0x2A Preamble

2 1 Continued / Size

3 1 Packet Type

4 1–127 Packet Data

The ﬁrst two bytes is the standard preamble to separate the protocol from returned keypresses. The next

byte is described in the Table below. The CONT ﬂag speciﬁes that the data will be continued in the next

DRP packet. The lower seven bits contains the size of the data section excluding the four byte header. The

type speciﬁes what type of information is contained in the packet. Finally, the data returned is speciﬁc to the

packet type.

Table 10: Continued / Size Byte

Bit Description

7 Continued

3 Packet Size

Table 11: Display Return Protocol Types

Decimal Hex ASCII Description

49 0x31 ’1’ 1-Wire data

82 0x52 ’R’ Fan RPM data

Matrix Orbital LK202-24-USB 21

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 47 48

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Matrix-orbital LK202-24-USB Manual de usuario Pagina 25