Elec Freaks Bluetooth Modem Manuel d'utilisateur télécharger pdf (Page 23)

Appendix 2: The introduction of devices

The Class of Device/Service(CoD) is a 32 bits number that of 3 field specifies the

service supported by the device. Another field specifies the minor device class, which

describes the device type in more detail

The Class of Device /Service (CoD) field has a variable format. The format is

indicated using the ’within the CoD .The length of the Format Type field is variable and

ends with two bits different from’11’.The version field starts at the least significant bit

of the CoD and may extend upwards. In the ’format#1’ of the CoD (format Type field

=00), 11 bits are assigned as a bit –mask (multiple bits can be set) each bit

corresponding to a high level generic category of service class. Currently 7 categories

are defined. These are primarily of a’ public service’ nature. The remaining 11 bits are

used for indicating device type category and other device-specific characteristics. Any

reserved but otherwise unassigned bits, such as in the Major Service Class field, should

be to 0.

Figure 1.2: The Class of Device/Service field (format type). Please note the krder in

which the octets are sent on the air and stored in memory. Bit number 0 is sent first on

the air .

1. MAJOR SERVICE CLASSES

Bit no Major Service Class

13 Limited Discoverable Mode [Ref #1]

14 (reserved)

15 (reserved)

16 Positioning(Location identification)

17 Networking (LAN, Ad hoc, … )

18 Rendering (Printing ,Speaker,…)

19 Capturing (Scanner, Microphone,…)

20 0bject Transfer (v-Inbox, v-Folder,…)

21 Audio (Speaker, Microphone, Headset service,…)

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 29

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Elec Freaks Bluetooth Modem Manuel d'utilisateur Page 23