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FAQ - 232IOEXT using SDDRB4

232IOEXT using SDDRB4

The SDDRB4 Relay Board can be used with the 232IOEXT but the jumper positions are not shown on the data sheet for the Relay Board. Customer must look up the 232IOEXT I/O pin mapping for Digital Outputs 0-3 and 4-7.

See Table 2 below for JP1 position to match the channels.

SDDRB4 Table 1 for 232SDD16 or 485SDD16 – Output Channel/Pin Mapping

JP1

A

 

B

 

C

 

D

 

Position

Channel

Pin

Channel

Pin

Channel

Pin

Channel

Pin

0-3

0

9

1

10

2

11

3

12

4-7

4

13

5

25

6

24

7

23

8-11

8

22

9

21

10

19

11

18

12-15

12

17

13

16

14

15

15

14

SDDRB4 Table 2 for 232IOEXT – Input Channel Mapping to Output Channel/Pins

JP1

(Actual)

A

 

B

 

C

 

D

 

Position

 

Channel

Pin

Channel

Pin

Channel

Pin

Channel

Pin

0-3

Invalid

Input 0

9

Input 1

10

Input 2

11

Input 3

12

4-7

Invalid

Input 4

13

Input 5

25

Input 6

24

Input 7

23

8-11

(0-3)

Output 0

22

Output 1

21

Output 2

19

Output 3

18

12-15

(4-7)

Output 4

17

Output 5

16

Output 6

15

Output 7

14

Note: The input channel of one module activates the matching output channel of the other.
The pins for input to the 232IOEXT are carried through the SDDRB4 connectors.

232IOEXT I/O Port Connections/Pins

DB-25S Pin#

Function

DB-25S Pin#

Function

1

No Connection

14

Output 7

2

No Connection

15

Output 6

3

No Connection

16

Output 5

4

No Connection

17

Output 4

5

No Connection

18

Output 3

6

No Connection

19

Output 2

7

Ground

20

No Connection

8

+12 VDC

21

Output 1

9

Input 0

22

Output 0

10

Input 1

23

Input 7

11

Input 2

24

Input 6

12

Input 3

25

Input 5

13

Input 4

 

 

Notes:

Inputs have built-in Pull-ups for dry contacts/switch closure to Ground on Pin 7.

Outputs can source about 3 mA with current limiting resistor, or sink about 8mA with current limiting resistor. Typical mini Red or Green LED will light with 3K to 3.6K current limiting resistor in series with LED and output.