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Chapter 3. Communications Operations of the BHT
3.3 RS-232C Interface Specifications
[ 1 ] Interface Connector and Pin Assignment
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 SGSD
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.