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5.3 Basic Communication Specifications and
Parameters
5.3.1
Basic Communication Specifications
The table below lists the basic IrDA communication specification.
Synchronization
Transmission speed
Transmission code
Transmission bit order
Vertical parity
Note1: 460800 bps is only possible when communicating from one BHT-900 unit to another or with the
CU-921, CU-911.
Synchronization
For accurate data transaction, it is necessary to synchronize transmission between the sender and
receiver. To achieve this, the bit order and position, character length, and beginning and end of the
character to be transmitted must be defined beforehand.
Start-stop synchronization is an asynchronous system that synchronizes each character as a unit; that is,
it externally adds start and stop bits to the leading and trailing bit positions of the character to be
transmitted, respectively. Data sampling is commenced upon receiving the start bit, and when the stop bit
is received, sampling is completed and communication ceased. The number of stop bits can be selected
(1 or 2 bits).
Transmission Speed
This is the maximum number of bits that can be transmitted per second, and is expressed in bps (bits per
second).
IrDA Interface Communication Range
The maximum effective range of the IrDA interface is 15 cm, with the IR beam within a 10° angle of
divergence. To communicate via the CU-900, put the BHT on the CU-900.
IrDA Interface Transmission/Receipt Switching Time
The IrDA interface must satisfy the following conditions for transmission and receipt switching.
(1) The IrDA interface must be ready to receive within 10 ms following the completion of transmission.
(2) The IrDA interface must commence transmission after waiting at least 10 ms following the completion
of receipt.
IrDA Interface
Start-stop
9600, 19200, 38400,
57600, 115200,
(Note1)
460800
bps
ASCII 8-bit code
LSB (Least significant bit) first
None
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