CIO-DO24DD
&
CIO-DO48DD
User’s Manual
Revision 5
November, 2000
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HM CIO-DO##DD.lwp
TABLE OF CONTENTS
1.0 INTRODUCTION
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2.0 SOFTWARE INSTALLATION
3.0 HARDWARE INSTALLATION
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4.0 INTERFACING
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5.0 CONTROL & DATA REGISTERS
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6.0 SPECIFICATIONS
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1
11.1 DIRECT DRIVE
11.2 DARLINGTON TRANSISTORS
11.3 CLAMPING VOLTAGE
2
2
23.1 BASE ADDRESS
43.2 INSTALLING IN THE COMPUTER
5
54.1 CONNECTOR DIAGRAMS
64.2 CABLING TO THE CONNECTOR
64.3 CONNECTOR PIN ASSIGNMENTS
64.4 THE OUTPUT CIRCUIT
74.5 SIGNAL CONNECTION
84.6 CLAMPING VOLTAGE INPUT
94.7 TEST CONNECTIONS
10
105.1 INTRODUCTION
115.2 REGISTER FORMATS - BOTH 24- AND 48-BIT VERSIONS
115.3 REGISTER FORMAT-CIO-DO48DD, CONNECTOR P2 ONLY
12
This page is blank.
1.0 INTRODUCTION
CIO-DO24DD and CIO-DD48DD are desig ned for switching circuits of higher
voltage and current than standard TTL type components are capable of. They provide
24 and 48 outputs respectively.
The ‘DD’ designation indicates that these boards are capable of ‘Direct Drive.’ The
current specification that earns the direct drive designation is a switching capacity of
up to 500 mA.
Throughout this manual the part number CIO-DO24DD is used for both products
since most of information applies to both. Where necessary, the appropriate part
number is noted.
Both the CIO-DO24DD and the CIO-DD48DD are s upported by the Universal
Library programming library for DOS and Windows available from Measurement
Computing.
1.1 DIRECT DRIVE
The CIO-DO24DD is similar to a set of non-isolated solid state relays. The digital
lines of the DD are capable of completing a circuit to ground thereby allowing current
to flow in the circuit. Because there is a small amount of OFF current flowing in the
circuit, like a solid state relay, the circuits on a DD board are not ideal for switching
low level signals. If you have a circuit that is suitable for solid state relays and does
not need isolation, the DD board can be substituted.
1.2 DARLINGTON TRANSISTORS
Each output is an NPN Darlington pair. All outputs are open collector and incorporate
clamping diodes for transient suppression. The ability to withstand transients, connect
directly to voltages up to 50V and sink as much as 500 mA make these outputs ideally
suited for controlling lamps, relays, printer hammers and similar loads.
1.3 CLAMPING VOLTAGE
The clamping voltage is th at voltage which, when exceeded, is clam ped to prev ent
damage to th e circuit. The clamping voltage of each 8-bit port can be set
independently and must be supplied externally. In addition, the open collector points
of each 8-bit port can be pulled to a common voltage by connecting an eight-resistor
SIP.
1
2.0 SOFTWARE INSTALLATION
On the disk labeled InstaCal there is an installation program. Please run this program
and accept the defaults. Refer to th e Extended Software Installation Manual for
complete instructions. If you have purchased the Universal L ibrary for programming
language support, use that disk to install both InstaCal and the Universal Library.
InstaCal will guide you through switch and jumper settings you may need to make
before installing y our board. Detailed information on hardware settings is also
provided below.
3.0 HARDWARE INSTALLATION
3.1 BASE ADDRESS
The boards are setup at the factory with the base address set to 300h (768 decimal). If
there are no other devices installed in your computer that are using addresses 300h
through 304h (or 308h if using the CIO-DO48DD), do not change the base address.
The CIO-DO24DD employs the PC bus for power, communications and data transfer.
As such it draw s power from the PC, monitors the address lines and control signals
and responds to it’s I/O address, and places data on the eight data lines.
The BASE address is the only user selectable bu s related feature of the
CIO-DO24DD. The base address identifies the registers that software writes to when
communicating with the CIO-DO24DD.
A block of eight (or seven) DIP switches are used for setting the base address. Each
switch position corresponds to one of the PC bus address lines. Placing a switch down
asserts that address bit.
A complete address is constructed by calculating the HEX or decimal number which
corresponds to all the address bits the board has been instructed to respond to. For
example, in Figure 3-1, (for CIO-DO24DD) address switches 9 and 8 for are DOWN,
all others UP. See Figure 3-2 for the address select switches for the CIO-DO48DD.
Address 9 = 200h (512D) and address 8 = 100h (256 decimal), when added together
they equal 300h (768 decimal).
2
Figure 3-1. CIO-DO24DD Address Select Switches
e
NOTE
DISREGARD THE NUMBERS PRINTED ON T HE SWITCH.
REFER TO THE NUMBERS PRINTED IN W HITE ON T HE
BOARD!
9876
BASE ADDRESS SWITCH
54
3
SW
A9
A8
A7
A6
A5
A4
A3
- Address 300H shown her
HEX
200
100
80
40
20
10
08
Figure 3-2. CIO-DO48DD Address Select Switches
Certain addresses are u sed by the PC, others are free and can be u sed by the
CIO-DO24DD and other expansion boards. R efer to Table 3-1 for PC register
addressing. We recommend BASE = 300h (768 decimal) be tried first.
3
Table 3-1. PC I/O Addresses
FUNCTIONHEX
RANGE
070-071
The CIO-DO24DD BASE switch can be set for address in the range of 000-3FC so it
should not be hard to find a free address area for CIO-DO24DD. Once again, if you
are not using IBM prototyping cards or s ome other board which occupies these
addresses, then 300-31F HEX are free to use.
CMOS RAM & NMI MASK (AT)
RANGE
FUNCTIONHEX
EGA2C0-2CF8237 DMA #1000-00F
EGA2D0-2DF8259 PIC #1020-021
GPIB (AT)2E0-2E78253 TIMER040-043
SERIAL PORT2E8-2EF8255 PPI (XT)060-063
SERIAL PORT2F8-2FF8742 CONTROLLER (AT)060-064
PROTOTYPE CARD300-30F
PROTOTTYPE CARD310-31FDMA PAGE REGISTERS080-08F
HARD DISK (XT)320-32F8259 PIC #2 (AT)0A0-0A1
PARALLEL PRINTER378-37FNMI MASK (XT)0A0-0AF
SDLC380-38F8237 #2 (AT)0C0-0DF
SDLC3A0-3AF80287 NUMERIC CO-P (AT)0F0-0FF
MDA3B0-3BBHARD DISK (AT)1F0-1FF
PARALLEL PRINTER3BC-3BFGAME CONTROL200-20F
EGA3C0-3CFEXPANSION UNIT (XT)210-21F
CGA3D0-3DFBUS MOUSE238-23B
SERIAL PORT3E8-3EFALT BUS MOUSE23C-23F
FLOPPY DISK3F0-3F7PARALLEL PRINTER270-27F
SERIAL PORT3F8-3FFEGA2B0-2BF
Addresses not specifically listed, such as 390-39F, are not reserved and may be
available. Check your computer for other boards which may use I/O addresses.
3.2 INSTALLING IN THE COMPUTER
1. Turn the power off.
2. Remove the cover of your computer. Please be careful not to dislodge any of the
cables installed on the boards in your computer as you slide the cover off.
3. Locate an empty expansion slot in your computer.
4. Push the board firmly down into the exp ansion bus connector. If it is not seated
fully it m ay fail to work and could short circuit the PC bus power onto a PC bus
signal. This could damage the m otherboard in your PC as well as the
CIO-DO24DD.
4
4.0 INTERFACING
4.1 CONNECTOR DIAGRAMS
The output connector(s) is a 50-pin header type connector accessible from the rear of
the PC through the expansion back plate (Figure 4-1). The output signals are direct
connections to the Darlington output transistor.
P1
1A0
1A1
1A2
1A3
1A4
1A5
1A6
1A7
1B0
1B1
1B2
1B3
1B4
1B5
1B6
1B7
1C0
1C1
1C2
1C3
1C4
1C5
1C6
1C7
CIO-DO24DD PIN OUT or
CIO-DO48DD, P1 CONNECTOR
P2
4
5
6
2A0
2A1
2A2
2A3
2A4
2A5
2A6
2A7
2B0
2B1
2B2
2B3
2B4
2B5
2B6
2B7
2C0
2C1
2C2
2C3
2C4
2C5
2C6
2C7
CIO-DO48DD, P2 CONNECTOR
Figure 4-1. Connector Pin Outs
The connectors accepts female 50-pin header type connectors, such as th ose on the
C50FF-2, a 2-foot cable with female connectors.
If frequent changes to signal co nnections or signal co nditioning is required, please
refer to the information on the CIO-TERM100, CIO-SPADE50 and CIO-MINI50
screw terminal boards.
5
4.2 CABLING TO THE CONNECTOR
The CIO-DO24DD connector is accessible through the PC/AT expansion bracket.
The connector is a standard 50-pin header connector. A cable with mating connectors
(C50FF-##) can be purchased from Measurement Computing Corp. The second
output connector for the CIO-DO48DD is on the end of the card opposite the
expansion bracket.
4.3 CONNECTOR PIN ASSIGNMENTS
The connector is arranged so that there is generally a ground return for each control
line, and each 8 lines of a port are together on the cable.
The signal P ull Up# is the inp ut to the pull-up resistor SIP associated with a p ort.
Applying a voltage to that pin will pull up all lines of a port to that voltage through the
user-installed SIP resistor when the circuit is open.
The signal Port n Clamp is the clam ping voltage input for that port. For example, if
the circuit you are switching at port A is a 24 volt circuit but is subject to 100V
spikes, connect 24V to the Port A Clamp input and any signal over 24V will be
clamped to 24V.
4.4 THE OUTPUT CIRCUIT
The heart of the CIO-DO24DD is a Darlington pair of transistors. It is composed of a
ULN2803 and a few passive components. It works much the same as a solid state
relay. A simplified schematic of the circuit is shown in figure 4-2.
The load device is wired to the Output Pin so that your device is energized ON when a
path to ground is completed. If desired, a clamping voltage can be supplied to the
Port N Clamp input.
The circuit is switched by the PC setting a register bit. When a 1 is written to a bit in
the register for a particular port, the Darlington transistors associated with that bit are
turned on and your circuit is completed via a path from the output pin to PC Ground.
6
Figure 4-2. Darlington Output Circuit
All outputs share a com mon ground on the board so all your circuits must use the
common ground. Also, as with any transistor circuit, there is a small amount of OFF
current.
4.5 PULL-UP RESISTORS
There are locations for pull-up resistors on the board. They are marked RN1 through
RN3 (through RN6 on the CIO-DO48DD).
These locations are designed to accept 9 pin SIP resistors configured as eig ht
individual resistors with one end in common. Each resistor in the SIP package makes
a connection between one of the Darlington collectors and the pin labeled “Pull Up #”
for the port associated with that particular Darlington transistor.
For example, installing a 9 pin SIP resistor into the location marked “RN1” places a
resistor between all of the Darlington collectors for Port A1 and the pin labeled “Pull
Up 1”. A voltage applied to this pin becomes the supply voltage for all eight of the
Darlington transistors in Port A1.
4.6 SIGNAL CONNECTION
The output circuits are capable of completing a circuit of up to 50 volts and having a
current of up to 500 mA.
1. The voltage specification applies only when the transistor is off. The
transistor can block up to 50V.
7
2. The current specification applies on ly when the transistor is on. The
transistor can pass up to 500 mA.
Figure 4-3 is an example of a simple circuit. It shows a lamp with a 9 volt battery.
The positive battery terminal is connected to a contact of the lamp. The other lamp
connection is tied to the Darlington output. The negative side of the battery is
connected to GND (pin 44). When you write a 1 to the A0 bit, the Darlington turns on
completing the circuit and the lamp lights.
Figure 4-3. Darlington Explained
Notice in Figure 4-3 above, that an equivalent, simplified circuit based on a resistor is
shown to the right o f the Darlington circuit. The Darlington transistors act like a
switch which alternates between two resistors, one of great resistance and one of
minimal resistance. Notice that when the Darlington is OFF, th ere is some leakage
current flowing. Notice also that when the transistors are ON, there is a small voltage
drop across the Darlington. Both these aspects of the switch should be considered in
the design of your overall circuit.
The current can only flow from the pins labeled A#, B#, and C# to ground, and the PC
must share a common ground with your circuit.
For specifications of the leakage current and ON voltage of the Darlington, please see
the specifications in the back of this manual.
8
4.7 CLAMPING VOLTAGE INPUT
The output transistors can be set to clamp voltage spikes and prevent them from
damaging your circuit. For example, if you are switching a 9V circuit, connect the
9V to the clamp input as well. This will hold transient voltages to less than 11V (9V
+ 2V max forward voltage across the clamping diode at 350mA).
4.8 TEST CONNECTIONS
The CIO-DO24DD is a digital switching device. To test the installation and the board
you will need a kno wn working circuit to switch, such as a lamp bulb and battery
described previously.
After you have the circuit connected, the TEST option of the
used to produce an alternating on/off signal at the switch.
Insta
Cal program can be
9
5.0 CONTROL & DATA REGISTERS
5.1 INTRODUCTION
CIO-DO24DD is a direct drive, 24-line digital switching board built up of logic chips.
There are n o configuration registers as su ch. There are on ly four (or eight) buffer
registers for holding the output values. The output circuits are capable of switching up
to 500 mA at up to 50V.
Each board is composed of parallel ou tput chips. Each address contains one latch
and one buffer controlling 8 output pins. The ports are arranged in sets of 3, with an
intervening unused address. This scheme allows partial compatibility with
applications written to control 82C55 based boards in which the 8 2C55 is used for
output only. On those boards ev ery fourth address contains a configuration register.
partial
The
the CIO-DO24DD or CIO-DO48DD.
To write control data to an o utput register, the individual bits must be set to 0 or 1
then combined to form a byte.
Table 5-1 has the register assignments for the CIO-DO24DD and CIO-DO48DD.
Note that the last four registers (Base + 4 to +7) apply only to the CIO-DO48DD.
compatibility arises from the lack of a read back of the output buffers on
Table 5-1. Register Assignments
WRITE FUNCTIONREAD FUNCTIONADDRESS
Port 1A Outputs (24 & 48 bit models)ID CodeBASE + 0
Port 1B Outputs (24 & 48 bit models)NoneBASE + 1
Port 1C Outputs (24 & 48 bit models)NoneBASE + 2
NoneNoneBASE + 3
Port 2A Outputs ( 48 bit model only)NoneBASE + 4
Port 2B Outputs ( 48 bit model only)NoneBASE + 5
Port 2C Outputs ( 48 bit model only)NoneBASE + 6
NoneNoneBASE + 7
Notice that the register layout is very similar to that of a standard 82C55 based digital
I/O board and the other high drive digital output boards. The alignment of ports A, B
& C are id entical and the position normally occupied by the configuration register is
left empty. This is so your existing digital board software will work without
modification.
10
5.2 REGISTER FORMATS - BOTH 24- AND 48-BIT VERSIONS
PORT 1A DATA
BASE ADDRESS + 0
01234567
1A01A11A21A31A41A51A61A7
PORT 1B DATA
BASE ADDRESS + 1
01234567
1B01B11B21B31B41B51B61B7
PORT 1C DATA
BASE ADDRESS + 2
01234567
1C01C11C21C31C41C51C61C7
5.3 REGISTER FORMAT-CIO-DO48DD, CONNECTOR P2 ONLY
PORT 2A DATA
BASE ADDRESS + 4
01234567
2A02A12A22A32A42A52A62A7
PORT 2B DATA
BASE ADDRESS + 5
PORT 2C DATA
BASE ADDRESS + 6
01234567
2B02B12B22B32B42B52B62B7
01234567
2C02C12C22C32C42C52C62C7
11
6.0 SPECIFICATIONS
Power consumption
+5V
CIO-DO24DD 275mA typical, 345mA max
CIO-DO48DD 425mA typical, 535mA max
Digital Output
Digital Type ULN2803 Darlington (open
collector)
Configuration
CIO-DO24DD 3 banks of 8 outputs each
CIO-DO48DD 6 banks of 8 outputs each
Number of channels
CIO-DO24DD 24
CIO-DO48DD 48
Maximum output voltage, V
CE
Maximum continuous current, Ic 500mA
Output leakage current
Vo = 50V, Ta = +70 °C 100 µA max
Vo = 50V, Ta = +25 °C 50 µA max
Collector-Emitter saturation voltage
= 350mA, iB = 500µA 1.1V typ, 1.6Vmax
i
C
= 200mA, iB = 350µA 0.95V typ, 1.3Vmax
i
C
= 100mA, iB = 250µA 0.85V typ, 1.1Vmax
i
C
Clamp diode reverse leakage current
Vr = 50V, Ta = +25 °C 50 µA max
Clamp diode forward voltage
Diode current = 350mA 1.5V typ, 2.0V max
50V
Environmental
Operating temperature range 0 to 50°C
Storage temperature range −20 to 70°C
Humidity 0 to 90% non-condensing
12
For your notes.
13
For your notes.
14
EC Declaration of Conformity
We, Measurement Computing Corporation, declare under sole responsibility that the
product:
CURRENT OUTPUT BOARD CIO-DO24DD &
CIO-DO48DD
DescriptionPart Number
to which this declaration relates, meets the essential requirements, is in conformity
with, and CE marking has been applied according to the relevant EC Directives listed
below using the relevant section of the following EC standards and other normative
documents:
EU EMC Directive 89/336/EEC
compatibility.
EU 55022 Class B
characteristics of information technology equipment.
EN 50082-1
IEC 801-2
and control equipment.
IEC 801-3
measurements and control equipment.
IEC 801-4
equipment.
Carl Haapaoja, Director of Quality Assurance
: Electrostatic discharge requirements for industrial process measurement
: Radiated electromagnetic field requirements for industrial process
: Electrically fast transients for industrial process measurement and control
: Limits and methods of measurements of radio interference
: EC generic immunity requirements.
: Essential requirements relating to electromagnetic
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(508) 946-5100
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