Turning Ideas Into Reality

ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104

Part Number SIOA7

Copyright © 2014 ABCircuits. Revised September 2014 Page 3 of 10

OUTPUT A3

INPUT A4

U2

8

5

7

6

1

4

2

3

VCC

GND

-DO/-RI

DO / RI

RO

DI

-RE

DE

VCC

VCC

SEE EXPANSION CIRCUIT

INPUT A1

INPUT A3

OUTPUT A4

INPUT A0

INPUT A5

4.7K

INPUT A2

U2 MAX3485 FOR 3.3V

OUTPUT A6

OUTPUT A2

VCC

OUTPUT A0

INPUT A6

7 BITS INPUT/OUTPUT RS-485

U2 75176 FOR 5V

SIOA7

15

9

16

17

18

19

3

6

7

8

10

11

13

14

22

12

20

23

28

21

4

1

2

5

24

25

26

27

IA0

NC

IA2

IA4

IA6

NC

ADR1

OA5

OA3

OA1

NC

IA5

IA1

VSS

OA4

IA3

OA0

OA6

VDD

OA2

SOUT-

RXP

ADR3

NC

SIN-

ADR0

ADR2

TXE

RS485

OUTPUT A5

OUTPUT A1

INPUT A0

.1

OUTPUT A1

.01

CASE

4.7

OUTPUT A2

OUTPUT A4

VCC

OUTPUT A0

VCC

INPUT A5

USB

1

2

3

4

5

INPUT A6

BEAD

SIOA7

15

9

16

17

18

19

3

6

7

8

10

11

13

14

22

12

20

23

28

21

4

1

2

5

24

25

26

27

IA0

NC

IA2

IA4

IA6

NC

ADR1

OA5

OA3

OA1

NC

IA5

IA1

VSS

OA4

IA3

OA0

OA6

VDD

OA2

SOUT-

RXP

ADR3

NC

SIN-

ADR0

ADR2

TXE

FT232-SSOP

14

13

22

23

11

2

5

1

19

16

15

8

24

27

28

3

6

9

10

12

CBUS3

CBUS2

CBUS1

CBUS0

-CTS

DTR

RXD

TXD

-RST

USBM

USBP

NC

NC

OSCI

OSCO

RTS

RI

DSR

DCD

CBUS4

7 BITS INPUT/OUTPUT USB

OUTPUT A6

OUTPUT A5

INPUT A1

OUTPUT A3

INPUT A3

REFER TO FT232 DATASHEET

FOR MORE DETAILS

INPUT A2

SEE EXPANSION CIRCUIT

.1

INPUT A4