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 (¿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.
SD RD SG
3-pole Mini Stereo Plug (¿2.5 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.
