B&B Electronics 232SDD16 User Manual

RS-232 Digital I/O Module

Model 232SDD16

Documentation Number 232SDD16-1005

Designed and Manufactured

In Ottawa, Illinois

of domestic and imported parts by

B&B Electronics Mfg. Co. Inc.

707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350

PH [phone] -- FAX [phone]

http://www.bb-elec.com

[e-mail]

[e-mail]

 1995 B&B Electronics -- Revised February 2005

pn#3604-r1

This product

USA

Internet:

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Table of Contents

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

232SDD16 Features............................................... 1

Packing List............................................................2

232SDD16 Specifications....................................... 3

I/O Lines................................................................................3

Digital Inputs......................................................................3

Digital Outputs...................................................................3

Power Supply........................................................................3

Communications ...................................................................3

Size .......................................................................................3

Chapter 5 - Software.............................................. 21

Programming Techniques.....................................21

Read I/O States Command.................................................21

Read Configurat ion Command ...........................................22

Set Output States Command..............................................24

Define I/O Lines Command.................................................25

Set Power-up States Command .........................................25

Demonstration Program ....................................... 27

Hard Drive Installation .......... Error! Bookmark not defined.

Running Demonstration Program .......................................27

APPENDIX A..........................................................A-1

ASCII Character Codes.......................................A-1

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

Define I/O Lines Command..................................13

Set Power-up States Command........................... 14

Read Configuration Command............................. 14

Chapter 4 - I/O Interfacing..................................... 17

Digital Inputs......................................................... 17

Digital Outputs...................................................... 19

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-4

DBM16 Interfacing ............................................................C-5

Inputs.............................................................................C-5

Outputs..........................................................................C-7

DBM16 Specificat ions.......................................................C-9

I/O Lines ........................................................................C-9

Inputs.................................................................................C-9

Outputs..............................................................................C-9

Power Supply ................................................... .............C-9

Size................................................................................C-9

APPENDIX D.......................................................D-1

Adding Data Field Confirmation...........................D-1

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Chapter 1- Introduction

232SDD16 Features

The 232SDD16 is a general purpose control module that is
connected to your computer’s RS-232 serial port. The 232SDD16
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.
The digital outputs are CMOS/TTL compatible. The digital inputs
are CMOS/TTL compatible. The digital I/O lines are available
through a DB-25S (female) connector.
The 232SDD16 connects to your computer’s RS-232 serial port
through a DB-25S connector. 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-volatile memory.
The configuration parameters consists of I/O definitions, and output
power-up states.

The unit may be powered by setting RTS and DTR high on the
serial port. If the 232SDD16 cannot be powered using the
handshake lines, it may be powered with +12Vdc through the 2.5mm
jack or through the DB-25 I/O connector.

NOTE: When using an external supply, the supply should be
connected only to specifically labeled power inputs (power
jack, terminal block, etc.). Connecting an external power supply
to the handshake lines may damage the unit. Contact technical
support for more information on connecting an external power
supply to the handshake lines.

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. 232SDD16 unit

2. Software

3. This instruction manual
If any of these items are damaged or missing contact B&B
Electronics immediately.

Figure 1.1 - 232SDD16 Module

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232SDD16 Specifications

I/O Lines

Total: 16 (Factory default = inputs)

Digital 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.

Digital Outputs

Low Voltage: 0.6 Vdc @ 8.3 milliamps (Sink)
High Voltage: 4.3 Vdc @ -3.1 milliamps (Source)

Power Supply
Input Voltage: 8 Vdc to 16 Vdc

External power: 35 milliamps* @ 12Vdc
Port power: 15 milliamps* (The RS-232 RTS
and DTR lines must be high to port
power unit.)
Doesn’t include the power consumption of external devices.

Communications
Standard: RS-232 (unit is DCE)

Baud Rate: 1200 to 9600 (automatic detection)
Format: 8 data bits, 1 stop bit, no parity
Connector: DB25S (female)

Size 0.7" x 2.1" x 4.7"

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Chapter 2 - Connections

This chapter will cover the connections required for the
232SDD16. There are three sets of connections: digital I/O, serial
port, and power supply. Do not make any connections to the
232SDD16 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 Chapt er 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/TTL compatible.

Ground

The pin should be connected to your external digital devices
ground.

Table 2.1 - 232SDD16 I/O Port Pinout

DB-25S

Pin #

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

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

DB-25S

Pin #

Function

Serial Port Connections

In order to communicate to the 232SDD16 module it must be
connected to an RS-232 serial port. 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.
device (See Table 2.2). If your communications equipment is
configured as a DTE device, such as a standard IBM PC serial port,
the 232SDD16 should be connected using a “straight through” DB­25 cable or a standard DB-9 to DB-25 cable adapter as shown in
Table 2.3. If your communications equipment is configured as a
DCE device, such as a modem, the 232SDD16 should be connected
using a “null modem” cable (See Table 2.4).

The 232SDD16 is configured as a DCE

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Table 2.2 - RS-232 Connector Pinout

DB-25S

Pin #

Signal

Signal

Direction at

232SDD16

Notes

2 Transmit Data (TD) Input Connection is required.
3 Receive Data (RD) Output Connection is required.
4 Request to Send

(RTS)

Input May be used to power

unit if kept high.

7 Signal Ground (SG) Connection is required.

20 Data Terminal

Ready (DTR)

Input May be used to power

unit if kept high.

Table 2.3 - 232SDD16 To DTE Connections

232SDD1

6 Pin #

Signal

DTE DB-

25

Connection

2 Transmit Data (TD) 2 3
3 Receive Data (RD) 3 2
4 Request to Send (RTS) 4 7
7 Signal Ground (SG) 7 5

20 Data Terminal Ready (DTR) 20 4

DTE DB-9

Connection

Table 2.4 - 232SDD16 To DCE Connections

232SDD16

Pin #

2 Transmit Data (TD) 3 2
3 Receive Data (RD) 2 3
4 Request to Send (RTS) 5 8
7 Signal Ground (SG) 7 5

20 Data Terminal Ready

(DTR)

Signal

DCE DB-25

Connection

DCE DB-9

Connection

6 6

Power Supply Connections

Power to the 232SDD16 can be supplied by the RS-232 serial
port handshake lines (RTS, DTR) or by an external power supply
through the 2.5mm power jack or from the I/O connector. Most serial
ports can provide enough power to supply the 232SDD16’s 15
milliamp requirement. If you plan to use this method to power the
unit, your software must set the RS-232 RTS and DTR lines to the
high state. 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 232SDD16
Specification Section of this manual.

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Chapter 3 - Commands

There are only two commands required to control the 232SDD16:
set output lines, and read I/O lines. Three additional commands are
used for configuring the module: define I/O lines, set power-up
states, and read configuration. Command strings are from four to
six bytes in length; the “!” character, the “0” (zero) character, two
command characters, and one or two data bytes, if required. (See
Table 3.1).

Table 3.1 - 232SDD16 Commands

Function Command Response
Set Output Lines !0SO{I/O msb}{I/O lsb} no response

Read I/O Lines !0RD {I/O msb}{I/O lsb}
Define I/O Lines !0SD{I/O msb}{I/O lsb} no response
Set Power-up States !0SS{I/O msb}{I/O lsb} no response

Read Configuration !0RC

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 chara cters, for example: “!0RD”. 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 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 listed above. Refer to Appendix A for more ASCII
and decimal equivalents.

I/O Definitions
{I/O msb}{I/O lsb}
Power-up States
{I/O msb}{I/O msb}

Table 3.2 - Equivalent Values

ASCII Decimal Hexadecimal

! 33 21h

0 48 30h
C 67 43h
D 68 44h
O 79 4Fh
R 82 52h
S 83 53h

Syntax

Command strings consists 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 (useful in RS-485
networks). Since the 232SDD16 uses RS-232 communications, this
byte is always the ASCII “0” character and can not be changed. 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. This field
contains the fifth and sixth data byte, a Most Significant and a Least
Significant data byte respectively.

Command Syntax: ! 0 _ _ _ _
| | | | | |
| | | | | 6th Data Byte
| | | | 5th Data Byte
| | | 2nd Command Byte
| | 1st Command Byte
| Address Byte
Start of Message Byte

I/O Data Bytes

When constructing commands to manipulate outputs 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-bit binary 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 stat e, and all

other outputs to a LOW state (shown in bold face) -

MS Byte LS Byte

Shown in binary - 10000001 00000011

Shown in decimal - 129

(128+1)

Shown in hexadecimal - 81

(80h+1h)

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

MS Byte LS Byte

Shown in binary - 11001000 01010010

Shown in decimal - 200

(128+64+8)

Shown in hexadecimal - C8

(80h+40h+8h)

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

3

(2+1)

3

(2h+1h)

82

(64+16+2)

52

(40h+10h+2h)

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: !0RD
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: 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 posit i on
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 l ine
as an output.

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Command: !0SO
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: 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.

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: !0SD
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: 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.

Set Power-up States Command

The Set Power-up States 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: !0SS
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><10000000>
Description: the first byte sets output lines #15, 14, 12, 11, 9, & 8
HIGH and output lines #13, & 10 LOW at power-up; the second byte
sets output line #7 HIGH and output lines #6, 5, 4, 3, 2, 1, & 0 LOW
at power-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 and the outputs power-up state. Four data byt es are
returned. The first two data bytes contain the definition of th e 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 the power-up states 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" the power-up state
of the output will be LOW, if set to a "1" the output will be HIGH.

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