Denso BHT-100B User Manual

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Chapter 3.  Communications Operations of the BHT-100Q/100B

The BHT has a direct-connect interface port which is connectable to the 3-pole mini
stereo plug (ø2.5 mm or 0.1") and supports a subset of the RS-232C interface as shown
below.

Using a direct-connect interface cable having the mini stereo plugs makes it possible
to connect the BHT to a host computer (or another BHT) directly without any routing
through the CU-7000.

RD

SG

SD

3-pole Mini Stereo Plug (ø2.5 mm or 0.1")

The poles of the plug are assigned as listed below.

Signal Name

Function

        Signal Input/Output

      BHT         External device

SD

Send data

→

RD

Receive data

←

SG

Signal ground

The input/output voltage threshold for the logical valued signal is listed below.

Logical Value

Input Voltage Threshold

Output Voltage Threshold

(RD)

(SD)

0

3V min.

5V min.

1

-3V max.

-5V max.

• The direct-connect interface port is not designed to stand frequent connecting/

disconnecting.  Do not plug and unplug basically more than one time a day;
otherwise, the service life of the plug will shorten.  To connect the BHT to a host
computer having no IR port (or another BHT) frequently, use the CU-7000.

• Allow the specified signals only to enter the direct-connect interface port.  Entry

of other signals will result in a failure or malfunction of the BHT.