DAISY-9 is an RS232 DTE serial interface, not optoisolated, with TXD, RXD, CTS and RTS signals. It is part of the modular Daisy System that can be controlled by the FOX Board G20 via the DAISY-1 Adapter, or by the Terra Board.

The following table shows which DAISY-1 (Fox) and Terra connectors accept this module:

Port	Serial device	Signals
Fox D1	/dev/ttyS2	TXD, RXD, RTS, CTS
Fox D3	/dev/ttyS1	TXD, RXD, RTS, CTS
Fox D6	/dev/ttyS4	TXD, RXD, RTS, CTS
Fox D8	/dev/ttyS3	TXD, RXD
Terra D10	/dev/ttyS4	TXD, RXD, RTS, CTS
Terra D13	/dev/ttyS2	TXD, RXD, RTS, CTS

The obsolete BeeBoard can accept a single DAISY-9 module on port W1 (TXD/RXD only).

The DAISY-9 board measures 40 × 45 × 18 mm. The RS232 controller is a Maxim MAX3232.

RS232 Pinout

Pin	Function	Direction
1
2	RXD - Receive data	Input
3	TXD - Transmit data	Output
4
5	GND - Signal ground
6
7	RTS - Request to send	Output
8	CTS - Clear to send	Input
9

DAISY-9 RS232 Interface Examples

Examples for FOX Board G20

• daisy9e1.py is a basic example of how to use a serial port in Python. It requires the pySerial module.
• daisy9e2.c is a basic example of how to use a serial port in C. Refer to the Termios and GNU Low-Level I/O documentation.

Example for BeeBoard

• daisy9e3.pde sends the analog-to-digital converter value to the serial port.

DAISY-9 RS232 Interface Module Resources

• DAISY-9 Schematic (PDF)
• DAISY-9 Mechanical Drawing (DWG)
• MAX3232 Datasheet