B&B Electronics 485SDD16 User Manual

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RS-485Digital I/O Module

Model 485SDD16

Document ation Number 485SDD16-1005 pn#3605-r1

This product

Designed and Manufactured

In Ottawa, Illinois

USA

of domestic and imported parts by

B&B Electronics Mfg. Co. Inc.

707 Dayton Road --P.O. Box 1040--Ottawa, IL 61350 PH (815)433-5100--FAX (815)433-5104

Internet: http://www.bb-elec.com sales@bb-elec.com support@bb-elec.com

B&B Electronics --Revised February 2005

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Table of Contents

 

Chapter 1- Introduction ...........................................

1

485SDD16 Features...............................................

1

Packing List ............................................................

2

485SDD16 Specifications .......................................

2

I/O Lines................................................................................

2

Inputs .................................................................................

2

Outputs ..............................................................................

2

Power Supply ........................................................................

3

Communications ...................................................................

3

Size .......................................................................................

3

Chapter 2 - Connections .........................................

5

Digital I/O Connections...........................................

5

Digital Inputs .........................................................................

5

Digital Outputs.......................................................................

5

Ground ..................................................................................

5

Serial Port Connections ..........................................

6

Power Supply Connections.....................................

8

Chapter 3 - Commands ...........................................

9

Syntax ..................................................................

10

I/O Data Bytes.....................................................................

10

Read I/O Lines Command ....................................

12

Set Output Lines Command .................................

12

Set Module Address Command............................

13

Set Turn-aroundDelay Command........................

13

Define I/O Lines Command ..................................

14

Set Power-upStates Command ...........................

15

Read Configuration Command .............................

15

Chapter 4 - I/O Interfacing.....................................

17

Digital Inputs.........................................................

17

Digital Outputs ......................................................

19

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Chapter 5 - Software..............................................

 

21

Programming Techniques.....................................

 

21

Read I/O Lines Command ..................................................

 

21

Read Configuration Command ...........................................

22

Set Output States Command

..............................................

24

Define I/O Lines Command.................................................

 

25

Set Power-upStates Command .........................................

26

Set Module Address Command ..........................................

27

Set Turn-aroundDelay Command......................................

28

Demonstration Program .......................................

 

29

Hard Drive Installation..........

Error! Bookmark not defined.

Running Demonstration Program .......................................

29

APPENDIX A..........................................................

 

A-1

ASCII Character Codes .......................................

 

A-1

APPENDIX B..........................................................

 

B-1

Hexadecimal/Decimal Conversions .....................

B-1

APPENDIX C..........................................................

 

C-1

Interface Modules for SDD16 Models..................

C-1

DTB25 .................................................................

 

C-2

DBM16 ................................................................

 

C-3

DBM16 Interfacing ............................................................

 

C-4

Inputs .............................................................................

 

C-5

Outputs ..........................................................................

 

C-7

DBM16 Specifications.......................................................

 

C-8

I/O Lines ........................................................................

 

C-8

Inputs .........................................................................

 

C-8

Outputs ......................................................................

 

C-8

Power Supply ................................................................

 

C-8

Size................................................................................

 

C-8

Appendix D

 

 

Adding Data Field Confirmation.........................

D-1

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Chapter 1- Introduction

485SDD16 Features

The 485SDD16 is a general purpose control module that operates through an RS-485interface. The 485SDD16 offers 16

discrete digital I/O lines. With these features, the module can be used to sense external ON/OFF conditions and to control a variety of devices.

Each of the sixteen I/O lines can be defined as either an input or an output. The digital outputs are CMOS compatible. The digital inputs are CMOS/TTL compatible. The digital I/O lines are available

through a DB-25S(female) connector.

The 485SDD16 connects to the host computer’s RS-485or RS422 serial port using terminal blocks. The address andturn-arounddelay are software programmable to allow for use of multiple devices or connection to existingmulti-nodesystems. The unit automatically detects baud rates from 1200 to 9600. A data format of 8 data bits, 1 stop bit and no parity is used.

Configuration parameters are stored in non-volatilememory. These parameters consists of module address, communication turnaround delay, I/O definitions, and outputpower-upstates.

The unit is powered by connecting +12Vdc to terminal blocks or to the DB-25SI/O connector.

Figure 1.1 - 485SDD16 Module

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Figure 1.2 - Simplified Block Diagram

Packing List

Examine the shipping carton and contents for physical damage. The following items should be in the shipping carton:

1.485SDD16 unit

2.Software

3.This instruction manual

If any of these items are damaged or missing contact B&B Electronics immediately.

485SDD16 Specifications

I/O Lines

 

 

Total:

16

(Factory default = inputs)

Inputs

 

 

Voltage Range:

0 Vdc to 5 Vdc

Low Voltage:

1.0

Vdc max.

High Voltage:

2.0

Vdc min.

Leakage Current:

1 microamp max.

Outputs

 

 

Low Voltage:

0.6

Vdc @ 8.3 milliamps (Sink)

High Voltage:

4.3

Vdc @ -3.1milliamps (Source)

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Power Supply

 

Input Voltage:

8 Vdc to 16 Vdc @ 35 milliamps

 

(Doesn’t include the power

 

consumption of external devices.)

Connection:

Terminal Blocks or DB-25S

Communications

 

Standard:

RS-422/485

Addresses:

256 (Factory default = 48 decimal)

Turn-aroundDelay:

Software programmable from 0 to

 

255 character transmission times.

 

(Factory default = 1)

Baud Rate:

1200 to 9600 (automatic detection)

Format:

8 data bits, 1 stop bit, no parity

Connection:

Terminal Blocks

Optical Isolation: If optical isolation is required, use B&B’s 485HSPR high-speedoptically isolated converter with this product.

Size

0.7" x 2.1" x 5.2"

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Chapter 2 - Connections

This chapter will cover the connections required for the 485SDD16. There are three sets of connections: digital I/O, serial port, and power supply. Do not make any connections to the 485SDD16 until you have read this chapter.

Digital I/O Connections

Connections to the I/O lines are made through the DB25S (female) I/O port connector. Refer to Table 2.1. See Chapter 5 for I/O interfacing examples.

Digital Inputs

The digital input lines are CMOS/TTL compatible and can handle voltages from 0Vdc to +5Vdc.

Digital Outputs

The digital output lines have a maximum voltage of +5Vdc and are CMOS compatible.

Ground

This pin should be connected to the external digital devices ground.

Table 2.1 - 485SDD16 I/O Port Pinout

DB-25S

 

 

DB-25S

 

Pin #

Function

 

Pin #

Function

 

 

 

 

 

1

No connection

 

14

I/O #15

2

No connection

 

15

I/O #14

3

No connection

 

16

I/O #13

4

No connection

 

17

I/O #12

5

No connection

 

18

I/O #11

6

No connection

 

19

I/O #10

7

Ground

 

20

No connection

8

+12Vdc Input

 

21

I/O #9

9

I/O #0

 

22

I/O #8

10

I/O #1

 

23

I/O #7

11

I/O #2

 

24

I/O #6

12

I/O #3

 

25

I/O #5

13

I/O #4

 

 

 

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Serial Port Connections

In order to communicate to the 485SDD16 module it must be connected to an RS-422/RS-485serial port. The 485SDD16 will work on a2-wireor4-wireRS-485multi-nodenetwork. Refer to B&B Electronics’ freeRS-422/485Application Note for more information. The unit automatically detects baud rates from 1200 to 9600. A data format of 8 data bits, 1 stop bit and no parity is used. Connections are made using terminal blocks. Table 2.2 shows the terminal blocks and their functions.

Table 2.2 - RS-485Terminal Block Connections

 

 

Signal

 

TB

 

Direction at

Notes

Label

Signal

485SDD16

 

 

 

 

FR

Frame

-

Connection for frame ground.

GND

Ground

 

 

TD(A)

Transmit

Output

Connection is required. [Loop to

 

Data (A)

 

RD(A) for 2-wirehookup]

TD(B)

Transmit

Output

Connection is required. [Loop to

 

Data (B)

 

RD(B) for 2-wirehookup]

RD(A)

Receive

Input

Connection is required. [Loop to

 

Data (A)

 

TD(A) for 2-wirehookup]

RD(B)

Receive

Input

Connection is required. [Loop to

 

Data (B)

 

TD(B) for 2-wirehookup]

+12V

+12 Vdc

Input

Connection is required.

 

Power

 

 

GND

Ground

-

Connection for Signal GND and

 

 

 

Power Supply GND.

A typical 2-wireRS-485connection is shown in Figure 2.3 and a typicalRS-422(orRS-4854-wire)connection is shown in Figure 2.4. Note that the 485SDD16 data line labels use “A” and “B” designators (per EIARS-485Specification). However, someRS-485equipment uses “+” and“-“as designators. In almost all cases, the “A” line is the equivalent of the“-“line and the “B” is the equivalent of the “+” line. With anRS-485/422system there are other factors that require consideration, such as termination andturn-arounddelay. For more information refer to B&B Electronics’ freeRS-422/485Application Note.

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Figure 2.3 - RS-4224-wireConnection

Figure 2.1 - Example of Multi-NodeNetwork

Power Supply Connections

Power to the 485SDD16 must be supplied by an external power supply connected to the +12Vdc and GND terminal blocks or to the I/O connector. An external power supply must be able to supply 8 to 16 Vdc at 35ma.

NOTE: Power requirements of the module does not include the power consumption of any external devices connected to the module. Therefore, any current that is sourced by the digital outputs must be added to this value and the current must not exceed the maximum output source current. Refer to the 485SDD16 Specification Section of Chapter 1.

Figure 2.2 - RS-4852-wireConnection

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Chapter 3 - Commands

There are only two commands required to control the 485SDD16: set output lines, and read I/O lines. Five additional commands are used for configuring the module: set module address, set turnaround delay, define I/O lines, set power-upstates, and read configuration. Command strings are from four to six bytes in length: the “!” character, an address byte, two command characters, and one or two data bytes (if required). (See Table 3.1).

Table 3.1 - 485SDD16 Commands

Function

 

Command

Response

 

 

 

 

Read I/O Lines

 

!{addr}RD

{I/O msb}{I/O lsb}

Set Output Lines

 

!{addr}SO{I/O msb}{I/O

no response

 

 

lsb}

 

Set Module Address

 

!{addr}SA{new adr}

no response

Set Turn-around

 

!{addr}SC{#}

no response

Delay

 

 

 

Define I/O Lines

 

!{addr}SD{I/O msb}{I/O lsb}

no response

Set Power-upStates

 

!{addr}SS{I/O msb}{I/O lsb}

no response

 

 

 

I/O Definitions

Read Configuration

 

!{addr}RC

{I/O msb}{I/O lsb}

 

 

 

Power-upStates

 

 

 

{I/O msb}{I/O msb}

 

 

 

RS-485Config.

 

 

 

{addr}{t-adelay}

Symbols: {...} represents one byte

 

 

<...> represents a numeric value

Before going into the specifics of each command, it is important to understand that a byte has a numeric value from 0 to 255. The byte's value can be represented in decimal (0 - 255) format, hexadecimal (00 - FF) format, binary (00000000 - 11111111) format, or as an ASCII character. The fixed bytes of each command will be represented as ASCII characters. For example the Read I/O command contains the following ASCII characters: “!" and "RD”. Refer to Table 3.1. However, it is important to remember that an ASCII character has a numeric value. Example: the ASCII "0" (zero) does not have a numeric value of zero but has a value of 48. The decimal and hexadecimal equivalents of some ASCII characters are shown in Table 3.2. Some commands require additional data bytes to complete the command. These data bytes may be represented in any of the formats list above. Refer to Appendix A for more ASCII and decimal equivalents.

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Table 3.2 - Equivalent Values

ASCII

Decimal

Hexadecimal

 

 

 

!

33

21h

0

48

30h

A

65

41h

C

67

43h

D

68

44h

O

79

4Fh

R

82

52h

S

83

53h

Syntax

Command strings consist of four to six bytes. The first byte is the start of message byte. The start of message byte is always the ASCII “!” character. The second byte is the address byte. This byte allows each unit to have a unique address. The factory default address is the ASCII "0" character. The next two bytes are the command characters. These bytes are ASCII characters and used to specify which command will be executed by the module. Some commands require an argument field containing a fifth and sometimes a sixth data byte. Commands that manipulate I/O lines require two data bytes, a MostSignificant and aLeastSignificant data byte respectively.

Command Syntax: !

0

_

_

_

_

|

|

|

|

|

|

|

|

|

|

|

6th Data Byte

|

|

|

|

5th Data Byte

|

|

|

2nd Command Byte

|

|

1stCommand Byte

|

Address Byte

 

 

Start of Message Byte

I/O Data Bytes

When constructing commands to manipulate output lines or when reading the state of the I/O lines it is necessary to know how to select and interpret the I/O data bytes. The sixteen I/O lines are represented by two data bytes. The Most Significant data byte represents I/O lines #15 through #8 and the Least Significant data byte represents I/O lines #7 through #0. The Most Significant byte is always sent and received first followed by the Least Significant byte.

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A byte represents an eight-bitbinary number (11111111), therefore each byte can represent eight I/O lines. Each bit is assigned a bit position and a weight (value). Refer to Table 3.3.

Table 3.3 - Bit Assignments for I/O Lines

 

MOST SIGNIFICANT I/O BYTE

 

 

 

I/O Line #

15

14

13

12

11

 

10

9

8

Bit Position

7

6

5

4

3

 

2

1

0

Hex Weight

80

40

20

10

8

 

4

2

1

Dec. Weight

128

64

32

16

8

 

4

2

1

 

 

 

 

 

LEAST SIGNIFICANT I/O BYTE

 

 

I/O Line #

7

6

5

4

3

 

2

1

0

Bit Position

7

6

5

4

3

 

2

1

0

Hex Weight

80

40

20

10

8

 

4

2

1

Dec. Weight

128

64

32

16

8

 

4

2

1

To set an output to a HIGH state the corresponding bit position must be set to a "1". Conversely to set an output LOW the corresponding bit position must be set to a "0". When reading I/O lines, any bit set to a "0" indicates the corresponding I/O line is in the LOW state and any bit set to a "1" indicates the corresponding I/O line is in the HIGH state.

Example 3.1 - To set outputs 15, 8, 1, and 0 to a HIGH state, and all other outputs to a LOW state (shown in bold face) -

Shown in binary -

MS Byte

 

LS Byte

10000001

 

00000011

Shown in decimal -

129

3

Shown in hexadecimal -

(128+1)

(2+1)

81

3

 

(80h+1h)

 

(2h+1h)

Example 3.2 - Reply from Read I/O command (shown in bold face) -

Shown in binary -

MS Byte

 

LS Byte

11001000

 

01010010

Shown in decimal -

200

82

Shown in hexadecimal -

(128+64+8)

(64+16+2)

C8

52

 

(80h+40h+8h)

 

(40h+10h+2h)

I/O lines #15, 14, 11, 6, 4, 1 are HIGH and all other I/O lines are LOW.

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Read I/O Lines Command

The Read I/O Lines command returns two data bytes that reflect the state of the I/O lines. The first data byte contains the most significant I/O lines (15 - 8). The second data byte contains the least significant I/O lines (7 - 0). If a bit is a "0" then the state of that I/O line is LOW. If a bit is a "1" then the state of that I/O line is HIGH.

Command: !{addr}RD Argument: none

Response: the state of the 16 I/O lines in two 8 bit bytes. (shown in bold face)

ASCII Example: !0RDÈR

Dec. Example: !0RD<200><82>

Hex. Example: !0RD<C8><52>

Bin. Example: !0RD<11001000><01010010>

Description: Read module 0's (decimal 48) I/O lines. The first byte indicates that I/O lines #15, 14, & 11 are HIGH and I/O lines # 13, 12, 10, 9, & 8 are LOW; the second byte indicates that I/O lines # 6, 4, & 1 are HIGH and I/O lines # 7, 5, 3, 2, & 0 are LOW.

Set Output Lines Command

The Set Output Lines command is used to set the states of the output lines. This command requires two data bytes. These data bytes specify the output state of each output line. The first data byte represents the most significant I/O lines (15 - 8). The second data byte represents the least significant I/O lines (7 - 0). If a bit position is set to a "0" then the state of that output line will be set LOW. If a bit position is set to a "1" then the state of that output line will be set HIGH.

NOTE: Refer to the "Define I/O Lines" command to define an I/O line as an output.

Command:

!{addr}SO

Argument:

{I/O msb}{I/O lsb}

Response:

none

ASCII Example: !0SOUA

Dec. Example: !0SO<85><65> Hex. Example: !0SO <55><41>

Bin. Example: !0SO<01010101><01000001>

Description: Set module 0's (decimal 48) output lines. The first byte sets output lines #14, 12, 10, & 8 HIGH and output lines #15, 13, 11, & 9 LOW; the second byte sets output lines #6, & 0 HIGH and output lines # 7, 5, 4, 3, 2, & 1 LOW. Note: If any of these lines are defined as inputs the bit settings are ignored.

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Set Module Address Command

The Set Module Address command is used to change the address of a 485SDD16. This commands requires one data byte. This data byte is used to specify the module's new address. Addresses can be assigned any decimal value from 0 to 255. The address is stored in non-volatilememory and is effective immediately. Each module must be assigned its own unique address when connected to anRS-485muti-nodenetwork.

Command: !{addr}SA Argument: {new address} Response: none

ASCII Example: !0SA9 Dec. Example: !0SA<57> Hex. Example: !0SA<39>

Bin. Example: !0SA<00111001>

Description: Change module address from ASCII "0" (48 decimal) to address ASCII "9" (57 decimal).

Set Turn-aroundDelay Command

The Set Turn-aroundDelay command sets the amount of time the 485SDD16 waits before transmitting its response. This ensures that no two drivers are enabled at the same time on atwo-wireRS485 network. Theturn-arounddelay is stored innon-volatilememory. This command requires a data byte that specifies the turnaround delay. Where{turn-arounddelay} is a number from 0 to 255. One unit ofturn-aroundis equal to one character transmission time. Theturn-arounddelay can be computed as follows:

character time = (1 / baud rate) * 10 turn-arounddelay = character time * data byte

Command:

!{addr}SC

Argument:

{turn-arounddelay}

Response:

none

ASCII Example: !9SC♦ Dec. Example: !9SC<04> Hex. Example: !9SC<04>

Bin. Example: !9SC<00000100>

Description: Set module 9's (decimal 57) turn-arounddelay to four

character transmission times (@ 9600 baud

the turn-arounddelay =

4.17ms).

 

 

 

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Define I/O Lines Command

The Define I/O Lines command is used to define each of the 16 I/O lines as either an input or an output. This command requires two data bytes. Each data byte defines eight I/O lines. The first data byte defines the eight most significant I/O lines (15 - 8). The second data byte defines the eight least significant digital I/O lines (7 - 0). If a bit position is set to a "0" then the I/O line will defined as an input. If a bit position set to a "1" then the I/O line will be defined as an output.

Command: !{addr}SD Argument: {I/O msb}{I/O lsb} Response: none

ASCII Example: !0SDUA

Dec. Example: !0SD<85><65>

Hex. Example: !0SD<55><41>

Bin. Example: !0SD<01010101><01000001>

Description: Define module 0's (decimal 48) I/O lines. The first byte define I/O lines #14, 12, 10, & 8 as outputs and I/O lines #15, 13, 11, & 9 as inputs; the second byte define I/O lines #6, & 0 as outputs and I/O lines #7, 5, 4, 3, 2, & 1 as inputs.

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Set Power-upStates Command

The Set Power-upStates command is used to set the states of output lines when the module's power is recycled. This command requires two data bytes. These data bytes specify the output state of each output line. The first data byte represents the eight most significant I/O lines (15 - 8). The second data byte represents the eight least significant I/O lines (7 - 0). If a bit position is set to a "0" then the state of that output line will be set LOW. If a bit position is set to a "1" then the state of that output line will be set HIGH.

Command: !{addr}SS Argument: {I/O msb}{I/O lsb} Response: none

ASCII Example: !0SSÛ@

Dec. Example: !0SS<219><64>

Hex. Example: !0SS<DB><40>

Bin. Example: !0SS<11011011><01000000>

Description: Set module 0's (decimal 48) power-upstates. The first byte sets output lines #15, 14, 12, 11, 9, & 8 HIGH and output lines #13, & 10 LOW atpower-up;the second byte sets output line #6 HIGH and output lines #7, 5, 4, 3, 2, 1, & 0 LOW atpower-up.NOTE: If any of these lines are defined as inputs the bit settings are ignored.

Read Configuration Command

The Read Configuration command returns the module's I/O definitions, the outputs power-upstate, the module's address, and theturn-arounddelay. Six data bytes are returned. The first two data bytes contain the definition of the eight most significant I/O lines (15 - 8) and the eight least significant I/O lines (7 - 0) respectively. If a bit position is set to a "0" the I/O line is defined as an input, if set to a "1" the I/O line is defined as an output. The second two data bytes contain thepower-upstates of the most significant output lines (15 - 8) and the least significant output lines (7 - 0) respectively. If a bit position is set to a "0" thepower-upstate of the output will be LOW, if set to a "1" the output will be HIGH. The fifth data byte is the module's address. The sixth data byte is theturn-arounddelay.

Command:

!{addr}RC

 

Argument:

none

 

Response:

definition of the sixteen I/O lines in two 8 bit bytes, and

the power-upstates in two 8 bit bytes. (shown in bold face)

 

 

 

485SDD16-1005Manual

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ASCII Example: !9RCUAP@9

Dec. Example: !9RC<85><65><80><64><57><04>

Hex. Example: !9RC<55><41><50><40><39><04>

Bin. Example: !0RC<01010101><01000001><01010000><01000000> <00111001><00000100>

Description: Read module 9's (decimal 57) configuration. The first byte (MSB of I/O definitions) - I/O lines #14, 12, 10, & 8 are outputs and I/O lines #15, 13, 11, & 9 are inputs; the second byte (LSB of I/O definitions) - I/O lines #6, & 0 are outputs and I/O lines #7, 5, 4, 3, 2, & 1 are inputs; the third byte (MSB of output power-upstates) - output lines #14, & 12 HIGH and output lines #10, & 8 LOW atpower-up;the fourth byte (LSB of outputpower-upstates) - output line #6 HIGH and output line #0 LOW atpower-up;the fifth byte (module address) is set ASCII "9" (decimal 57); the sixth byte (turnaround delay) is a decimal 4.

16

485SDD16-1005Manual

B&B Electronics --707 Dayton Road--Ottawa, IL 61350

B&B Electronics --707 Dayton Road--Ottawa, IL 61350

PH (815) 433-5100--FAX (815)433-5104

PH (815) 433-5100--FAX (815)433-5104