Denso BHT-400B-CE - Manual (Page 158)

5.1 Functions of the CU-400
The optical communication unit CU-400 series is available in two models: CU-401 and CU-421. The
CU-400 series has the following functions:
(1) Data exchange function
The CU-401/421 exchanges data and programs between the BHT and the host PC.
Interface with the BHT: IrDA interface
Interface with the host PC: RS-232C (CU-401)
USB
(CU-421)
(2) Battery cartridge charging function
The CU-400 charges the rechargeable battery cartridge loaded in the BHT.
NOTE: Before using the CU-421, you need to install the dedicated USB device driver stored in the
CD-ROM that comes with the CU-421. For the installation/uninstallation procedure, refer to the
guidebook that comes with the CU-421.
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