12
Serial Interface Board DB-9
IC U2 (MAX3232) converts the levels originated into the microcontroller serial interface, which
are of 3.3V to signals of ±10V, compatible with RS232 standard and the RS232 signals
originated from the outside in 3.3V signals compatible with the microcontroller. The available
signals on the interface are RXD, TXD, RTS and CTS.
The recognition of the interface connected to the control board is done with the reading of a
code associated to each kind of board through U1, enabled by the SELDEV signal generated by
the control board.
Pin 1, with voltage of +5V and a 500mA current, supplies peripheral equipments connected to
the serial port.
On the S1 dip-switch, it is possible to adjust the serial communication configurations (stop
bits, parity, etc.). Below, there are some charts that contain the functions of each set of
switches. The configurations in Underlined-Bold face
are the factory defaults.
Dip Switches
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON
DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1 2 3 4 5 6 7 8
ON DIP
1200
DIP SWITCH
BAUD RATE
DIP SWITCH
DIP SWITCH HANDSHAKING
STOP BITS
DIP SWITCH
DIP SWITCH LENGTH
PARITY
DEFAULT
2400
4800
9600
19200
38400
115200
230400
1 STOP BIT
NONE
ODD
EVEN
8 BITS
7 BITS
NONE
RTS/CTS
XON/XOFF
2 STOP BIT
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