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2. INTERFACES
10 2- DPT100-B/I/BT
10 metri
10 metri
• 3-Wire raw uses an IAS entry with classname IrDA:IrCOMM and at least two parameters. Its IAS definition
may be modified or extended over time. IrLPT has classname IrLPT, only one parameter, and the IAS definition
isfixed. IAS entry formats are defined in the next section.
Beyond these two distinctions, 3-Wire raw and IrLPT are the same.
2.3.1.5.3 IAS entry and hint bits
An entity advertising 3-Wire raw must set up the IAS entry in one of two forms:
• Classname IrDA:IrCOMM with two attributes, called IrDA:IrLMP:LsapSel, and Parameters. The Parameters
attribute has at least the service type parameter with at least the 3-Wire raw bit set in it.
Optionally IrDA:IrLMP:InstanceName
can be used to distinguish between two instances of this service. The
Discovery frame must have the IrCOMM
hint bit set. It should also have the printer bit set if this is a printing service.
• An alternate entry provided for backwards compatibility with some existing devices has Classname IrLPT
with just one attribute, called IrDA: IrLMP :LsapSel. The printer hint bit must be set in the Discovery frame.
This IAS object is only used for printing services.
2.3.1.5.4 Basic link operation
3-Wire raw connections must be exclusive - that is, all other non-IAS connections must terminate before the
raw connection is made, and all others must wait until the raw connection is broken before they can connect.
This is because 3-Wire raw uses IrLAP flow control, which flow controls off the entire physical link - multiple
connections under this scenario could result in deadlock. At connection, the 3-Wire raw service type can be
distinguished reliably by its LSAP-SEL alone, since unlike the cooked types (where multiple service types can
be referenced by IrDA:TinyTP:LsapSel) only 3-Wire raw can use the LSAP-SEL specified by
IrDA:IrLMP:LsapSel.
Once connected there is no control channel and no control parameters of any kind to look for - the only data
that comes over 3-Wire raw is the user data that would flow over TD and RD on a serial port or the 8 data
lines of a Centronics port. This means 3-Wire raw cannot be used to emulate any kind of hardware
handshaking or error reporting.
2.4 BLUETOOTH TECHNOLOGY PROTOCOL OVERVIEW (Only mod. DPT100-BT)
In the following paragraph there is a brief description of Bluetooth wireless technology protocol implemented in
the printer and differented elements that composed Bluetooth technology protocol.
To use the Bluetooth wireless communication protocol is necessary that in the set up the parameter
“Interface” in “BT”.
The printer is able to receive within a range of 10 m in a vacant envoirement.
2.4.1 Supported Protocols
The figure 2.10 shows the protocols that are previews in the standard Bluetooth wireless technology, and the
profiles that have been implemented in the printer (Object push profile e Serial port profile).
(Fig.2.9)