Denso BHT-300B Specifications download pdf (Page 138)

3.3

3.3.1

Basic Communications Specifications

and Parameters

Basic Communications Specifications

Listed below are the communications specifications when the BHT exchanges data with a host PC

through the IrDA interface or direct-connect interface.

IrDA Interface Direct-connect Interface

Synchronization Start-stop

Transmission Speed 2400, 9600, 19200, 38400,

57600, or 115200 bps

300, 600, 1200, 2400, 4800, 9600,

19200, 38400, 57600, or 115200 bps

Transmission Code JIS 8-bit codes JIS 7- or 8-bit codes

Transmission Bit Order LSB (Least significant bit) first

Vertical Parity None Even, odd, or none

 Synchronization

For accurate data transaction, it is very important to synchronize the transmission between the sender

and receiver. To do this, it is required to previously define the bit order and position, the character length,

and the beginning and end of the character to be transmitted.

The start-stop synchronization is an asynchronous system which 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. A clock starts counting on receiving the start bit and it falls into a

non-communication state on receiving the stop bit. The number of the stop bits is selectable (1 or 2 bits).

 Transmission Speed

Maximum number of bits to be transmitted per second. Expressed in bps (bits per second).

 IrDA Interface Communications Range

The IrDA interface's maximum effective range is 15 cm (5.9 in.) with the IR beam within a 10° angle of

divergence.

To communicate via the CU-300, put the BHT on the CU-300.

 Switching Time between Sending and Receiving on IrDA Interface

The IrDA interface should satisfy the following requirements in switching between sending and

receiving:

(1) Within 10 ms from completion of sending, the IrDA interface should become ready to receive.

(2) After 10 ms or more from completion of receiving, the IrDA interface should start sending.

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Denso BHT-300B Specifications Page 138