Revision Date:

May 23, 2006

ds_pl2303HX_v15F.doc

6.6 Endpoint 3 Descriptor: Bulk Data Input endpoint

Table 6-6 Endpoint3 Descriptor

Offset

Field

Size

Value

Description

0

bLength

Byte

07h

Size of this descriptor (in bytes)

1

bDescriptorType

Byte

05h

ENDPOINT descriptor type

2

bEndpointAddress

Byte

83h

Input endpoint

3

bmAttributes

Byte

02h

Transfer type is BULK

4

wMaxPacketSize

Word

0040h

64 bytes

6

bInterval

Byte

00h

Ignored field

6.7 String Descriptors

PL-2303HX supports four string descriptors:

Language ID

Manufacturer

Product

Serial Number

Except for Serial Number, the other three string descriptors are stored in the internal Mask ROM, i.e.

their contents are fixed. Serial Number is a special case. If the External EEPROM were not present, or

not properly programmed, then Serial Number would be hidden from the system. If the External

EEPROM is presented and properly programmed, then Serial Number will be read from the EEPROM.

The following tables demonstrate the current defined value for each descriptor:

6.7.1 String Descriptor 0 – Language ID

Table 6-7-1 String Descriptor – Language ID

Offset

Field

Size

Value

Description

0

bLength

Byte

04h

Size of this descriptor (in bytes)

1

bDescriptorType

Byte

03h

STRING descriptor type

2

bLANGID[0]

Word

0409h

English (United States)

6.7.2 String Descriptor 1 – Manufacturer

Table 6-7-2 String Descriptor – Manufacturer

Offset

Field

Size

Value

Description

0

BLength

Byte

32h

Size of this descriptor (in bytes)

1

bDescriptorType

Byte

03h

STRING descriptor type

2

bSTRING

⎯

⇒

“Prolific Technology Inc.” in UNICODE

PL-2303HX Product Datasheet

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Document Version 1.5E