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 (
φ
2.5
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.
3-pole Mini Stereo Plug (ø2.5 mm or 0.1")
The poles of the plug are assigned as listed below.
Signal Input/Output
Signal Name
Function
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
(RD)
Output Voltage Threshold
(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.
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