B&B Electronics 232DRIO User Manual

RS-232 Digital Relay I/O

Model 232DRIO

Documentation Number 232DRIO1005

Designed and Manufactured

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]

© B&B Electronics – January 2008

pn#4520-r2

This product

In Ottawa, Illinois

USA

Internet:

[e-mail]

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Table of Contents

Chapter 1- Introduction ........................................... 3

232DRIO Features .................................................. 3

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

232DRIO Specifications...........................................

Opto-Isolated Input ................................................................ 3

Relay Outputs ....................................................................... 3

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

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

Environment .......................................................................... 3

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

Chapter 2 - Connections ......................................... 5

I/O Connections ............................................ ………5

Opto-isolated Input ................................................................ 5

Relay Outputs ....................................................................... 5

Ground .................................................................................. 5

Serial Port Connections ........................................... 6

Power Supply Connections ...................................... 7

Chapter 3 - Commands ........................................... 9

Syntax ................................................................... 10

I/O Data Bytes ..................................................................... 11

Read I/O Lines Command ..................................... 13

Set Output Lines Command .................................. 13

3

Chapter 4 - I/O Interfacing ..................................... 15

Opto-isolated Input ................................................ 15

Relay Outputs ........................................................ 17

Chapter 5 - Software .............................................. 19

Programming Techniques ...................................... 19

Opening a COM Port........................................................... 19

Closing a COM Port ............................................................ 19

QuickBasic .......................................................................... 20

Read I/O States Command ................................................. 20

Set Output States Command .............................................. 20

C/C++ .................................................................................. 21

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

Set Output States Command .............................................. 21

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Demonstration Program ........................................ 22

Hard Drive Installation ......................................................... 22

Running Demonstration Program ....................................... 22

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

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

APPENDIX B .......................................................... B-1

Hexadecimal/Decimal Conversions ...................... B-1

ii Table of Contents 232DRIO-0308 Manual

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Chapter 1- Introduction

232DRIO Features

The 232DRIO is a general purpose data acquistion controller that
is connected to your computer’s RS-232 serial port. The 232DRIO
offers 1 opto-isolated input and 2 relay outputs. With these features,
the controller can be used to sense external ON/OFF conditions and
to control a variety of devices.
The relay outputs are CMOS/TTL compatible. The optically
isolated AC/DC input are also CMOS/TTL compatible. For
maximum flexibility, both input and outputs are connected with
internal screw type terminal blocks. Three LEDs are provided to
monitor the status of each of these.
The 232DRIO connects to your computer’s RS-232 serial port
through a DB-9F connector. The unit communicates at a baud rate
of 9600, 8 data bits, no parity, and 1 stop bit. This unit can not be
powered through the handshake lines because of the higher current
requirement to drive the relays. However, the unit may be powered
by an external +12Vdc source brought in through the power pin, pin
#9 of the serial port. If the 232DRIO cannot be powered using the
previous method, it may be powered with +12Vdc @ 100mA through
the supplied terminal blocks. Power supply is available.

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Figure 1.1 – 232DRIO Module

Serial Port
DB-9S

TD

RD

5-30 Vdc/Vac

Input

RS-232

Transceiver

+5V

R

Opto
Isolator

POWER

SPDT

RELAY

Microcontroller

SPDT

RELAY

GND
+12Vdc

#2 N/O
#2 N/C

#2 Com

#1 N/O

#1 N/C
#1 Com

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. 232DRIO unit

2. Software

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

232DRIO Specifications

Non-polarized, Optically Isolated Input

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Number of Channels: 1
Indication Mode
Logic “0”: LED on, digital voltage input high
Logic “1”: LED off, digital voltage input low
Input Electrical Characteristic
Voltage input low: <1.5 VAC/VDC
Voltage input high: 5-30 VAC/VDC @ 1mA to 30mA
Isolation Voltage: 2500 V
Leakage Current: 10 µA max.

Relay Outputs

Number of Channels: 2 electromechanical relays
Factory Default: Both relays de-energized

Indication Mode
Logic “0”: LED off, Relays de-energized
Logic “1”: LED on, Relays energized
Relay Ratings
Contact (standard): 10A @ 120VAC

8A @ 30VDC (resistive)
Max. switching capacity: 1200VA/240W
Max. operating voltage: 250VAC/125VDC

Max. carrying current: 10A (AC), 8A (DC) – standard

Min. permissible load: 100 mA @ 5 VDC
Relay Form: Form C, single-pole double-throw
(SPDT)
Output Terminals: Normally open (N/O) or
Normally close (N/C)
Relay Life (mech.): 10 million operations min.
Relay Life (load dependent): 100 thousand operations min.
Operating Time: 10 msec. max. (mean: ~5.1ms)

Power Supply
Input Voltage: 9-16 VDC

Input Current: 100 mA
Connections: Blue terminal block field wiring
Pin #9 (Power pin) of DB9F

Communications
Standard: RS-232 (unit is DCE)

Baud Rate: 9600
Format: 8 data bits, 1 stop bit, no parity

Environment
Operating Temperature: 0°-70°C

Operating Humidity: 0-95%, non-condensing

Storage Temperature: -20°-70°C
Size 4.60”L x 2.40"W x 1.32"H

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Chapter 2 - Connections

Do not make any connections to the 232DRIO until you have
read this chapter. Remember to power down the unit and any

other connected devices before making any kinds of connections.
Also be sure that the wires connected to the terminal blocks will
support the voltage and current requirements of your external
devices.

This chapter will cover the connections for the 232DRIO. There
are four sets of connections: opto-isolated input (optional), relay
outputs, serial port, and power supply.

I/O Connections

Connections to the I/O lines are made through the internal block
terminals. These should clearly be labeled on the board. Refer to
Table 2.1. See Chapter 5 for I/O interfacing examples.

Opto-isolated Input (black terminal blocks)

The non-polarized, opto-isolated input line is CMOS/TTL
compatible and can handle voltages from 0Vdc/Vac to +30Vdc/Vac.
Refer to the Specification for a complete detail.

Relay Outputs (blue terminal blocks)

The relay output lines have a maximum operating voltage of
+250Vac/+125Vdc and are CMOS/TTL compatible. Refer to the
Specification for a complete detail. Both relays are de-energized

at factory default settings.
Ground

Connect the ground correspondingly as marked. Do not
interchange the grounds for input and power. Otherwise, the input
will not be optically isolated. The input is non-polarized so the input
ground could be connected to either one of the black terminal while
the power ground must be connected as marked on the blue
terminal.

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Table 2.1 - 232DRIO Terminal Blocks

Blue
Pin # Function

1 - Ground Input Power 1 Opto-Isolated Input
2 +12Vdc Input Power 2 Opto-Isolated Input
3 #2 N/C-Normally Closed Non-polarized
4 #2 N/O-Normally Opened 0-30 Vdc/Vac
5 #2 C-Common
6 #1 C-Common
7 #1 N/C-Normally Closed
8 #1 N/O-Normally Opened

Black
Pin #

Function

Serial Port Connections

In order to communicate to the 232DRIO module it must be
connected to an RS-232 serial port. The unit is designed for a baud
rate of 9600, so the serial port must be set for this rate. A data
format of 8 data bits, 1 stop bit and no parity is used.
is configured as a DCE device (See Table 2.2). If your
communications equipment is configured as a DTE device, such as
a standard IBM PC serial port, the 232DRIO should be connected
using a “straight through” DB-25 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
232DRIO should be connected using a “null modem” cable (see
Table 2.4).

The 232DRIO

Table 2.2 – RS232 Connector Pinout

DB-9S
Pin #

2 Receive Data (RD) Output Required
3 Transmit Data (TD) Input Required
5 Signal Ground (SG) ------ Required
9 Power pin Input Can be wired to

Signal

Signal
Direction at
232DRIO

Notes

power unit

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