KONTRON
IrDA Interface
28
coolMONSTER/S User’s Guide
15.
IRDA INTERFACE
IRDA (named after the standardizing group ”InfraRed Data Association”) defines a standard for
high-speed infrared data transfer (over distances of about 1 meter). The
cool
MONSTER/S
provides
infrared communications capabilities. It operates in the following modes:
Sharp-IR
IrDA SIR (IrDA 1.0)
15.1
Sharp-IR
This mode supports bi-directional data communication with a remote device using infrared
radiation as the transmission medium. Sharp-IR uses Amplitude Shift Key (ASK) and allows serial
communication at baud rates up to 38.4K Baud. The format of the serial data is similar to the UART
data format, a zero value start bit, followed by up to 8 data bits, an optional parity bit, and ending
with at least one stop bit with a binary value of one. A 0 is signaled by sending a 500KHz continuous
pulse train of infrared radiation. A 1 is signaled by the absence of any infrared signal. The device
operation in Sharp-IR mode is similar to the operation in UART. The main difference is that the data
transfer is normally performed in half duplex fashion, and the modem control and status signals are
not used. The transfer signals rout to IRRX and IRTX.
15.2
IrDA SIR Mode
This is an operation mode similar to Sharp-IR. The IrDA 1.0 SIR allows serial communication at baud
rates up to 115.2K Baud. The data format is the same as Sharp-IR mode except no parity bit is
needed. Sending a single infrared pulse signals a zero. A one is signaled by not sending a pulse. The
width of each pulse is 3/16ths of a single bit time. The device operation in IrDA 1.0 SIR mode is
similar to the operation in UART. The main difference is that the data transfer is normally performed
in half duplex fashion, and the modem control and status signals are not used. The transfer signals
rout to IRRX and IRTX.
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