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SERIAL MODULE MOTHERBOARD
USER MANUAL
By: Nick Letheren Date: January 2003
Thank you for purchasing the TDK Bluetooth Intelligent Serial Module
Motherboard. This board allows the TDK Intelligent Serial Module to be
connected to a PC.
Related documents:
• Serial Module Hardware Interface Description
• TDK Bluetooth AT Serial Module Software Description
Circuit Description for Motherboard
Basically there 3 parts to the motherboard.
RS232 Serial interface. This provides a direct interface to any standard RS232 port
on a PC or peripheral. Component U2 is a level shifter on the RX, TX, CTS, RTS,
DTR, DSR, RI signals that converts between the 3.3V required on the module to the
standard RS232 level. 9-way D type connector (J2) is configured so that it will directly
connect to the Serial port of a PC.
Audio interface. Connector J9 allows a headset or audio source to be connected to
the Intelligent Serial Module. The PCM signals from the Serial module are converted
by CODEC (U4) to analog output. The Mic input is passed via the CODEC to the
PCM input of the module. The circuit is designed to drive a simple mobile phone type
headset.
Flash upgrade interface. The 25-way D type connector (J1) allows the Intelligent
Serial Module to be reflashed using the Bluelab utilities provided by CSR. The
connector is organised so that a direct one-to-one cable to the parallel port of a PC
will allow the utilities to run.
The Audio and Flash upgrade circuit are on one half of the PCB so that they could be
removed in applications using the RS232 interface only. The board is designed so
that if the wire links are removed it can be snapped in two parts.
Software
The motherboard and Intelligent Serial Module will connect to the Serial Port of any
PC. The user can simply communicate with the module using any Terminal Emulator
software such as Hyper-terminal or Procomm.
An alternative Emulator is included on the CD
. “TDK Terminal” is a terminal
emulation application capable of running on Windows 98/ME/2000/XP operating
systems. It was developed specifically to aid development and testing of TDK’s

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