Silicon Laboratories SiM3U1xx Manual de usuario descargar pdf (Pagina 3)

AN758

Rev. 0.1 3

3.1.2. Get Line Coding

This request allows the host to find out the currently configured line coding. Table 2 defines the line coding

properties.

3.1.3. Set Control Line State

This request generates RS-232/V.24 style control signals. Table 3 defines control signal bitmap.

Table 2. Line Coding Format

Offset Field Size Value Description

0 dwDTERate 4 Number Data terminal rate, in bits per second.

4 bCharFormat 1 Number 0: 1 Stop bit

1: 1.5 Stop bits

2: 2 Stop bits

5 bParityType 1 Number Parity:

0:None

1: Odd

2: Even

3: Mark

4: Space

6 bDataBits 1 Number Data bits (5, 6, 7, 8 or 16).

bmRequestType bRequest wValue wIndex wLength Data

10100001b GET_LINE_CODING 0 interface size of

structure

line coding

structure

bmRequestType bRequest wValue wIndex wLength Data

00100001b SET_LINE_CON-

TROL_STATE

control signal

bitmap

interface 0 none

Table 3. Control Signal Bitmap

Bit Position Description

15:2 Reserved (Reset to zero).

1 Carrier control for half duplex modems. This signal corresponds to V.24 signal

105 and RS232 signal RTS.

0: Deactivate carrier.

1: Activate carrier.

The device ignores the value of this bit when operating in full duplex mode.

0 Indicates to DCE if DTE is present or not. This signal corresponds to V.24 signal

108/2 and RS232 signal DTR.

0: DTE is not present.

1: DTE is present.

1 2 3 4 5 6 7 8 ... 29 30

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Silicon Laboratories SiM3U1xx Manual de usuario Pagina 3

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