Rs-232C Interface Specifications; 1 ] Interface Connector And Pin Assignment - Denso BHT-100B User Manual

3.2 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.
SD
The poles of the plug are assigned as listed below.
Signal Name
SD
RD
SG
The input/output voltage threshold for the logical valued signal is listed below.
Logical Value Input Voltage Threshold
0
1
• 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.
Chapter 3. Communications Operations of the BHT-100Q/100B
RD SG
3-pole Mini Stereo Plug (ø2.5 mm or 0.1")
Function
Send data
Receive data
Signal ground
(RD)
3V min.
-3V max.
111
Signal Input/Output
BHT External device
→
←
Output Voltage Threshold
(SD)
5V min.
-5V max.