Casio IT-2000W manual COM Driver for IrDA Overview, Frame Layer, IrLAP/IrLMP Layer

7.9COM Driver for IrDA

7.9.1Overview

The IrDA Driver consists of IRDA.DLL and IRCOMM.DRV. The former is processes the protocol section and the latter processes the port emulation and frame sections.

It is possible to set up parameters to define the operation of the IrDA section by writing them in the WIN.INI file.

Application

Windows API

Port Emulation Layer

IrCOMM Layer

TTP Layer

IrLAP/IrLMP Layer

Frame Layer

SIR FIR

Fig. 7.7

IRCOMM.DRV

IRDA.DRV

IRCOMM.DRV

This IrDA Driver supports three connection methods: 3-Wire Raw, 3-Wire, and 9-Wire.

Frame Layer

The frame layer is defined by the installed hardware (H/W). IrDA-SIR (Infrared Data Association- Serial Infrared Interface) conforms to UART 16550, and IrDA-FIR (Infrared Data Association-First Infrared Interface) uses the CASIO gate array with NEC CB-C8VM NAFIRL.

IrLAP/IrLMP Layer

The IrLAP (Infrared Link Access Protocol) layer supports only one connection link, and IrLMP (Infrared Link Management Protocol) layer can support a maximum of three connection links. (In practice, only one connection link is for users, since IAS of the IrCOMM Layer uses two connection links.)

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