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Rockwell Automation 842SPA Serial to Parallel Adaptor User Manual

Rockwell Automation Equipment

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Installation Instructions

Bulletin 842-SPA Serial to Parallel Adaptor

IMPORTANT: SAVE THESE INSTRUCTIONS FOR FUTURE USE.

Specifications

Size 103 x 165mm (4 x 6.5in)

Voltage Supply 11-32V DC

Supply Current 250mA (without load)

Operating Temperature 0_C to 50_C (32_F to 122_F)

Output Driver (parallel) PushĆpull, 10-32V, 35mA (max)

Input (SSI) RS422

Maximum SSI Cable Length 350m @ 125kHz; 25m @ 500kHz

Mounting Instructions

1. Locate and mount the 842–CH cardholder (purchased

separately) close to the controller. See the Dimensions
section to determine the 842–CH card holder hole
locations.

2. Wire the connections according to the a) Electrical

Connections b) Jumpers Needed and c) Direction Control
sections using wire size 26–16 AWG.

IMPORTANT: Wiring must be in accordance with the

National Electric Code and applicable local
codes and ordinances.

3. Insert the 842–SPA into the cardholder. Set the Hex

Function switch on the 842–SPA to the appropriate setting
as shown in Table 1 below:

Switch

Setting

Clock

Frequency

SSI

Input

Parallel

Output

4

500kHz

Binary

Binary

4

500kHz

Gray

Gray

5

125kHz

Binary

Binary

5

125kHz

Gray

Gray

6

500kHz

Gray

Binary

7

125kHz

Gray

Binary

4. Apply power supply of 11–32V DC to the 842–SPA.

5. The 842–SPA begins sending clock pulses and receives

data pulses in the synchronous serial interface (SSI)
format. An example timing diagram is in the Timing
Diagrams section.

6. The parallel output data can be found on the following bits

according to Table 2 below:

842A Encoder

Type

Pulses

Per Rev.

Bits Used

LSB-MSB

No. of

Revs.

Bits Used

LSB-MSB

A

8192

1-13

2048

14-24

B

4096

1-12

4096

13-24

C

2048

1-11

8192

12-24

D

4096

1-12

512

13-21

E

4096

1-12

256

13-20

Electrical Connections

Type

Function

842-CH Terminal

842-SPA and Output Driver

Ground

1A, 2C, 25AÊ

842-SPA Power

32C,13CÊ

Power & Ground

Parallel Output Driver

Power

31A

Encoder Power

32A

Encoder Ground

1C,25CÊ

Data +

26C

SSI

Data -

26A

SSI

Clock +

27C

Clock -

27A

Error Bit

2AË

Error Bit

2AË

Bit 1

3C

Bit 2

3A

Bit 3

4C

Bit 4

4A

Bit 5

5C

Bit 6

5A

Bit 7

6C

Bit 8

6A

Bit 9

7C

Bit 10

7A

Parallel Output

S T bl 2 f

Bit 11

8C

p

See Table 2 for

Bit Distribution

Bit 12

8A

Bit Distribution

Bit 13

9C

Bit 14

9A

Bit 15

14C

Bit 16

14A

Bit 17

15C

Bit 18

15A

Bit 19

16C

Bit 20

16A

Bit 21

17C

Bit 22

17A

Bit 23

18C

Bit 24

18A

Ê Terminals are connected internally on the 842-SPA.
Ë The Error Bit is normally logic 0. If there is a power interruption (i. e. - low voltage)

during data transmission, the Error Bit is set to logic 1.