Omega Products OME-PIO-D48 Installation Manual

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User’s Guide

OME-PIO-D48
PCI-Bus

Digital I/O Board

Hardware Manual

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OME-PIO-D48

User Manual

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 1

Table of Contents

1. INTRODUCTION .........................................................................................................................3

1.1 FEATURES ................................................................................................................................3

1.2 SPECIFICATIONS .......................................................................................................................4

1.3 ORDER DESCRIPTION ...............................................................................................................4

1.4 PCI DATA ACQUISITION FAMILY .............................................................................................5

1.5 PRODUCT CHECK LIST .............................................................................................................5

2. HARDWARE CONFIGURATION .................................................................................................6

2.1 BOARD LAYOUT & DEFAULT SETTING.....................................................................................6

2.2 I/O PORT LOCATION....................................................................................................................7

2.3 I/O PORT INITIALIZATION OPERATION .....................................................................................7

2.4 D/I/O ARCHITECTURE..............................................................................................................9

2.5 INTERRUPT OPERATION..........................................................................................................10

2.6 DAUGHTER BOARDS..................................................................................................................17

2.7 PIN ASSIGNMENT ...................................................................................................................22

3. I/O CONTROL REGISTER..........................................................................................................24

3.1 HOW TO FIND THE I/O ADDRESS.............................................................................................24

3.2 THE ASSIGNMENT OF I/O ADDRESS ........................................................................................29

3.3 THE I/O ADDRESS MAP ..........................................................................................................30

4. DEMO PROGRAM.........................................................................................................................38

4.1 PIO_PISO..............................................................................................................................39

4.2 DEMO1.................................................................................................................................41

4.3 DEMO2.................................................................................................................................43

4.4 DEMO3.................................................................................................................................44

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 2

1. Introduction

The OME-PIO-D48 provides 48 TTL digital I/O lines. The OME-PIO-D48
consists of two 24-bit bi-direction ports. Each 24-bit port supports three 8-bit
groups A, B, C. Each 8-bit group can be configured to function as either inputs
or latched outputs. All groups are configured as inputs upon power-up or reset.
Outputs of the I/O buffers are pulled up through 10K resistors to +5VDC.
Outputs can be changed to pull-down by jumper selection on the board. This
pull-up/pull-down mechanism assures that there are no erroneous outputs at
power-up until the board is initialized by application software.

The OME-PIO-D48 has one D-Sub connector and one 50-pin flat-cable
header. The header can be connected to a 50-pin flat-cable. The flat-cable can
be connected to OME-ADP-37/PCI or OME-ADP-50/PCI adapters. The adapter
can be fixed on the chassis. It can be installed in a 5 V PCI bus and supports
“Plug & Play”.

1.1 Features

• PCI Bus

• Up to 48 channels of digital I/O

• All I/O lines buffered on the board

• Eight-bit groups independently selectable for I/O on each 24-bit port

• Input/Output programmable I/O ports under software control

• SMD, short card, power saving

• Connects directly to OME-DB-24P, OME-DB-24R, OME-DB-24PR, OME-

DB-24PD, OME-DB-24RD, OME-DB-24PRD, OME-DB-16P8R, OME-DB-

24POR, OME-DB-24SSR or OME-DB-

• One 32-bit programmable internal timer

• One 16-bit event counter

• Interrupt source: 4 channels

• Pull-up or pull-down resistors on I/O lines

• Emulate two industrial-standard 8255 mode 0

• Buffer output for higher driving capability than 8255

• One D-Sub connector, one 50-pin flat cable connector

• Automatically detected by Windows 95/98/NT

• No base address or IRQ switches to set

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 3

1.2 Specifications

• All inputs are TTL compatible

Logic high voltage: 2.4V ( Min. )

Logic low voltage: 0.8V ( Max. )

• All outputs are TTL compatible

Sink current: 64 mA ( Max. )

Source current: 32 mA ( Max. )

• Power consumption: +5V @ 900mA

• Environmental :

Operating Temp. : 0°C to 60°C

Storage Temp. : -20°C to 80 °C

Humidity: 0 to 90 % non-condensing

Dimension : 156mm x 105mm

1.3 Order Description

• OME-PIO-D48 : PCI bus 48-bit opto-22 DIO board

1.3.1 Options

• OME-DB-24P, DB-24PD: 24 channel isolated D/I board

• OME-DB-24R, DB-24RD: 24 channel relay board

• OME-DB-24PR, DB-24PRD: 24 channel power relay board

• OME-DB-16P8R:16 channel isolated D/I and 8 channel relay output board

• OME-DB-24POR: 24 channel Photo Mos output board

• OME-DB-24SSR: 24 channel Solid State output board

• OME-DB-24C: 24-channel open-collector output board

• OME-ADP-37/PCI: extender, 50-pin header to OME-DB-37 for PCI Bus I/O

boards

• OME-ADP-50/PCI: extender, 50-pin header to 50-pin header, for PCI Bus I/O

boards

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 4

1.4 PCI Data Acquisition Family

We provide a family of PCI bus data acquisition cards. These cards can be

divided into three groups as following:

1. OME-PCI-series: first generation, isolated or non-isolated cards

OME-PCI-1002/1202/1800/1802/1602: multi-function family, non-isolated

OME-PCI-P16R16/P16C16/P16POR16/P8R8: D/I/O family, isolated

OME-PCI-TMC12: timer/counter card, non-isolated

2. OME-PIO-series: cost-effective generation, non-isolated cards

OME-PIO-823/821: multi-function family

OME-PIO-D144/D96/D64/D56/D48/D24: D/I/O family

OME-PIO-DA16/DA8/DA4: D/A family

3. OME-PISO-series: cost-effective generation, isolated cards

OME-PISO-813: A/D card

OME-PISO-P32C32/P64/C64: D/I/O family

OME-PISO-P8R8/P8SSR8AC/P8SSR8DC: D/I/O family

OME-PISO-730: D/I/O card

1.5 Product Check List

In addition to this manual, the package includes the following items:

• one piece of OME-PIO-D48 card

• one piece of software floppy diskette or CD

• one piece of release note

It is recommended to read the release note first. All important information will be given

in release note as following:

1. Where you can find the software driver & utility?

2. How to install software & utility?

3. Where is the diagnostic program?

4. FAQ

Attention !

If any of these items are missing or damaged, contact Omega Engineering

immediately. Save the shipping materials and the box in case you want to ship or store

the product in the future.

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 5

2. Hardware configuration

2.1 Board Layout & Default Setting

PCI BUS

JP3 (port-1)

3=pull-low

2

1=pull-High

PC=port-2

JP4 (port-2)

3=pull-low

PA=port-0

PB=port-1

2

1=pull-High

ome-DB-37

CN1

JP2 (port-0)

1=pull-High

2

3=pull-low

OME-PIO-D48

PCI BUS

JP7 (port-5)

3=pull-low

2

1=pull-High

JP6 (port-4)

3=pull-low

2

PA=port-3

PB=port-4

PC=port-5

1=pull-High

JP5 (port-3)

3=pull-low

CN2

50-pin

2

1=pull-High

Default Setting: JP2/3/4/5/6/7=2-3 short=pull-low

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 6

2.2 I/O Port Location

There are six 8-bit I/O ports in the OME-PIO-D48. Every I/O port can be

programmed as D/I or D/O port. When the PC is first power-up, all six ports are

configured as D/I port. These D/I ports can be pull-high or pull-low selected by JP2 ~

JP7. These I/O port locations are given as following:

Connector of OME-PIO-D48 PA0 to PA7 PB0 to PB7 PC0 to PC7

CN1

(OME-DB-37)

CN2

(50-pin head)

• Note 1: Refer to Sec. 2.1 for board layout & I/O port location.

• Note 2: Refer to Sec. 2.1 for JP 2 ~ 7 pull-high/pull-low.

port-0

(pull-high/low

by JP2)

port-3

(pull-high/low

by JP5)

port-1

(pull-high/low

by JP3)

port-4

(pull-high/low

by JP6)

port-2

(pull-high/low by

JP4)

port-5

(pull-high/low by

JP7)

2.3 I/O Port Initialization Operation

When the PC is powered-up, all operations of D/I/O port are disabled. The

enable/disable of D/I/O is controlled by the RESET\ signal. Refer to Sec. 3.3.1 for more

information about RESET\ signal. The power-up states are given as following:

• All D/I/O are disabled

• All six D/I/O ports are configured as D/I port

• All D/O latch register outputs are at high impedance.(refer to Sec. 2.4)

The user has to perform some initialization before using these D/I/Os. The

recommended steps are given as following:

Step 1: find address-mapping of PIO/PISO cards (refer to Sec. 3.1)

Step 2: enable all D/I/O (refer to Sec. 3.3.1)

Step 3: configure the first three ports to their expected D/I/O state & send the

initial value to all D/O ports (refer to Sec. 3.3.7)

Step 4: configure the other three ports to their expected D/I/O state & send the

initial value to all D/O ports (refer to Sec. 3.3.7)

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 7

The sample program is given as following:

/* step 1: find address-mapping of PIO/PISO cards */

clrscr();
wRetVal=PIO_DriverInit(&wBoards,0x80,0x01,0x30); /* for OME-PIO-D48 */
printf("\nThrer are %d PIO_D48 Cards in this PC",wBoards);
if (wBoards==0) exit(0);

printf("\n------------ The Configuration Space ----------------");
for(i=0; i<wBoards; i++)
{
PIO_GetConfigAddressSpace(i,&wBase,&wIrq,&wSubVendor,
&wSubDevice,&wSubAux,&wSlotBus,&wSlotDevice);

printf("\nCard_%d: wBase=%x,wIrq=%x,subID=[%x,%x,%x],
SlotID=[%x,%x]",i,wBase,wIrq,wSubVendor,wSubDevice,
,wSubAux,wSlotBus,wSlotDevice);
printf(" --> ");
ShowPioPiso(wSubVendor,wSubDevice,wSubAux);
}

/* select card_0 */
PIO_GetConfigAddressSpace(0,&wBase,&wIrq,&t1,&t2,&t3,&t4,&t5);

/* step 2: enable all D/I/O port */

outportb(wBase,1); /* enable D/I/O */

/* step 3: program 8255-1-PA-PB-PC as output port(first 3 port) */

outportb(wBase+0xcc,0x80);/* 8255-1-PA,PB,PC are all output port */
outportb(wBase+0xc0,0); /* 8255-1-PA initial value=0 */
outportb(wBase+0xc4,0); /* 8255-1-PB initial value=0 */
outportb(wBase+0xc8,0); /* 8255-1-PB initial value=0 */

/* step 4: program 8255-2-PA-PB-PC as output port(the other port)*/

outportb(wBase+0xdc,0x80);/* 8255-2-PA,PB,PC are all output port */
outportb(wBase+0xd0,0); /* 8255-2-PA initial value=0 */
outportb(wBase+0xd4,0); /* 8255-2-PB initial value=0 */
outportb(wBase+0xd8,0); /* 8255-2-PB initial value=0 */

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 8

2.4 D/I/O Architecture

3

(

)

I/O select (Sec. 3.3.7)

RESET\ (Sec. 3.3.1)

Data

(Sec. 3.3.7)

disable\

input Latch

Clock input

D/O latch CKT

D/I/O

• The RESET\ is in Low-state Æ all D/I/O operation is disable

• The RESET\ is in High-state Æ all D/I/O operation is enable.

• If D/I/O is configured as D/I port Æ D/I= external input signal

Æ can be pulled high or low selected by JP2/3/4/5/6/7

Data

(Sec. 3.3.7)

disable

Buffer input

Clock input

D/I buffer CKT

1

VCC

(pull

JP2/JP3/JP4/JP5/JP6/JP7Æ pull-high/pull-low select

default: all JPs are in 2-3-short Æ select pull-low

2

10K

GND

(pull low)

(1-2-ON=pull-high, 2-3-ON=pull-low)

• If D/I/O is configured as D/O port Æ D/I = read back of D/O

• If D/I/O is configured as D/I port Æ send to D/O will change the D/O latch register

only. The D/I & external input signal will not change.

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 9

2.5 Interrupt Operation

There are four interrupt sources in OME-PIO-D48. These four signals are named as

INT_CHAN_0, INT_CHAN_1, INT_CHAN_2 and INT_CHAN_3. Their signal sources

are given as following:

INT_CHAN_0: PC3/PC7 from port-2(refer to Sec. 2.5.2)

INT_CHAN_1: PC3/PC7 from port-5(refer to Sec. 2.5.3)

INT_CHAN_2: Cout0(refer to Sec. 2.5.4)

INT_CHAN_3: Cout2(refer to Sec. 2.5.5)

If only one interrupt signal source is used, the interrupt service routine does not

have to identify the interrupt source. Refer to DEMO4.C, DEMO7.C, DEMO8.C,

DEMO9.C and DEMO10.C for more information.

If there are more than one interrupt source, the interrupt service routine has to

identify the active signals as following: (refer to DEMO11.C)

1. Read the new status of all interrupt signal sources(refer to Sec 3.3.5)

2. Compare the new status with the old status to identify the active signals

3. If INT_CHAN_0 is active, service it

4. If INT_CHAN_1 is active, service it

5. If INT_CHAN_2 is active, service it

6. If INT_CHAN_3 is active, service it

7. Update interrupt status

Note: If the interrupt signal is too short, the new status may be as same as old

status. In that condition the interrupt service routine can not identify which

interrupt source is active. So the interrupt signal must have hold_active long

enough until the interrupt service routine is executed. This hold_time is different

for different O.S. The hold_time can be as short as micro-second or as long as

second. In general, 20ms is enough for all O. S.

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 10

2.5.1 Interrupt Block Diagram of OME-PIO-D48

INT_CHAN_0

INT\

Level_trigger

The interrupt output signal of OME-PIO-D48, INT\, is

Active_Low

PC once a time. If the INT\ is fixed in low level, the OME-PIO-D48 will interrupt the
PC continuously. So the INT_CHAN_0/1/2/3 must be controlled in a pulse_type
signals. They must be fixed in low level state normally and must generate

. If the INT\ generate a low-pulse, the OME-PIO-D48 will interrupt the

INT_CHAN_1

INT_CHAN_2

INT_CHAN_3

initial_low

active_high

level-trigger &

a high_pulse to interrupt the PC.

The priority of INT_CHAN_0/1/2/3 is the same. If all these four signals are

active at the same time, then INT\ will be active only once a time. So the interrupt

service routine has to read the status of all interrupt channels for multi-channel interrupt.

Refer to Sec. 2.5 for more information.

DEMO11.C Æ for both INT_CHAN_0 & INT_CHAN_1

If only one interrupt source is used, the interrupt service routine does not have to

read the status of interrupt source. The demo programs; DEMO4.C to DEMO10.C; are

designed for single-channel interrupt demo as following:

DEMO4.C Æ for INT_CHAN_3 only

DEMO7.C Æ for INT_CHAN_2 only

DEMO8.C Æ for INT_CHAN_0 only

DEMO9.C Æ for INT_CHAN_0 only

DEMO10.C Æ for INT_CHAN_1 only

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 11

2.5.2 INT_CHAN_0

INT_CHAN_0

The INT_CHAN_0 must be fixed in low level state normally and

generate a high_pulse to interrupt the PC.

The INT_CHAN_0 can be equal to PC3&!PC7 or PC3 programmable as

following:(refer to Sec. 3.3.9)

01

00

10

PC3&!PC7(port-2)

Disable

PC3(port-2)

Inverted/Noninverted select

(INV0)

Enable/Disable select

(EN0)

CTRL_D3=0, CTRL_D2=1 Æ INT_CHAN_0=disable

CTRL_D3=1, CTRL_D2=0 Æ INT_CHAN_0=PC3 of port-2

CTRL_D3=0, CTRL_D2=0 Æ INT_CHAN_0=PC3&!PC7 of port-2

The EN0 can be used to enable/disable the INT_CHAN_0 as following: (refer to

Sec. 3.3.4)

EN0=0 Æ INT_CHAN_0=disable

EN0=1 Æ INT_CHAN_0=enable

The INV0 can be used to invert/non-invert the PC3 or PC3&!PC7 as following:

(Refer to Sec. 3.3.6)

INV0=0 Æ INT_CHAN_0=inverted state of (PC3 or PC3&!PC7 of port-2)

INV0=1 Æ INT_CHAN_0=non-inverted state of (PC3 or PC3&!PC7 of port-2)

Refer to demo program for more information as following:

DEMO8.C Æ for INT_CHAN_0 only (PC3 of port-2)

DEMO9.C Æ for INT_CHAN_0 only (PC3&!PC7 of port-2)

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 12

If the PC3 is a level signal, the interrupt service routine should use INV0 to

inverted/non-inverted the PC3 for high_pulse generation as following:

void interrupt irq_service()/* this ISR is in DEMO8.C */
{
if (now_int_state==1) /* now PC3 is changed to LOW */(a)
{ /* --> INT_CHAN_3=!PC3=HIGH now */

COUNT++; /* find a LOW_pulse (PC3) */

If((inport(wBase+7)&1)==0)/* the PC3 is still fixed in LOW */

Æ

{ /*
outportb(wBase+0x2a,1);/* INV0 select the non-inverted input */(b)
/* INT_CHAN_0=PC3=LOW --> */
/* INT_CHAN_0 generate a high_pulse */
now_int_state=0; /* now PC3=LOW */
}

else now_int_state=1; /* now PC3=HIGH */
/* (no need to generate high_pulse) */
}
else /* now PC3 is changed to HIGH */(c)
{ /* --> INT_CHAN_0=PC3=HIGH now */
/* find a HIGH_pulse (PC3) */

If((inport(wBase+7)&1)==1)/* the PC3 is still fixed in HIGH */
{ /* need to generate a high_pulse */
outportb(wBase+0x2a,0);/* INV0 select the inverted input */(d)
/* INT_CHAN_0=!PC3=LOW --> */
/* INT_CHAN_0 generate a high_pulse */
now_int_state=1; /* now PC3=HIGH */
}

else now_int_state=0; /* now PC3=LOW */
/* (no need to generate high_pulse) */
}
if (wIrq>=8) outportb(A2_8259,0x20);
outportb(A1_8259,0x20);
}

PC3

INV0

INT_CHAN_0

(a) (b) (c) (d)

need to generate a high_pulse */

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 13

2.5.3 INT_CHAN_1

INT_CHAN_1

01

00

10

Inverted/Noninverted select

The INT_CHAN_1 must be fixed in low level state normally and

must generate a high_pulse to interrupt the PC.

The INT_CHAN_1 can be equal to PC3&!PC7 or PC3 programmable as

following:(refer to Sec. 3.3.9)

Disable

PC3&!PC7(port-5)

PC3(port-5)

(INV1)

Enable/Disable select

(EN1)

CTRL_D5=0, CTRL_D4=1 Æ INT_CHAN_1=disable

CTRL_D5=1, CTRL_D4=0 Æ INT_CHAN_1=PC3 of port-5

CTRL_D5=0, CTRL_D4=0 Æ INT_CHAN_1=PC3&!PC7 of port-5

The EN1 can be used to enable/disable the INT_CHAN_1 as following: (refer to

Sec. 3.3.4)

EN1=0 Æ INT_CHAN_1=disable

EN1=1 Æ INT_CHAN_1=enable

The INV1 can be used to invert/non-invert the PC3 or PC3&!PC7 as following:

(Refer to Sec. 3.3.6)

INV1=0 Æ INT_CHAN_1=inverted state of (PC3 or PC3&!PC7 of port-5)

INV1=1 Æ INT_CHAN_1=non-inverted state of (PC3 or PC3&!PC7 of port-5)

Refer to demo program for more information as following:

DEMO10.C Æ for INT_CHAN_1 only (PC3&!PC7 of port-5)

NOTE: refer to Sec. 2.5.2 for active high-pulse generation.

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 14

2.5.4 INT_CHAN_2

INT_CHAN_2

Cout0

PC0

(port-2)

The INT_CHAN_2 must be fixed in low level state normally and

must generate a high_pulse to interrupt the PC.

The PC0 (port-2) can be inverted/non-inverted programmable as following:

(refer to Sec. 3.3.9)

CTRL_D1=0 Æ Cin0=PC0 of port-2

CTRL_D1=1 Æ Cin0=!PC0 of port-2

Inverted/Noninverted

select

(CTRL-D1))

Inverted/Noninverted

select

(INV2)

Enable/Disable

select
(EN2)

The EN2 can be used to enable/disable the INT_CHAN_2 as following: (refer to

Sec. 3.3.4)

EN2=0 Æ INT_CHAN_2=disable

EN2=1 Æ INT_CHAN_2=enable

The INV2 can be used to invert/non-invert the Cout0 as following: (Refer to Sec.

3.3.6)

INV2=0 Æ INT_CHAN_2=inverted state of (Cout0)

INV2=1 Æ INT_CHAN_2=non-inverted state of (Cout0)

Refer to demo program for more information as following:

DEMO7.C Æ for INT_CHAN_2 only (Cout0)

NOTE: refer to Sec. 2.5.2 for active high-pulse generation.

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 15

2.5.5 INT_CHAN_3

INT_CHAN_3

The INT_CHAN_3 must be fixed in low level state normally and

Cout2

Cout1

2M/32768 Hz

select

(CTRL-D0)

Inverted/Noninverted

select

(INV3)

Enable/Disable

select
(EN3)

generated a high_pulse to interrupt the PC.

The Cin1 can be 2M/32768Hz programmable as following: (refer to Sec. 3.3.9)

CTRL_D0=0 Æ Cin1=2M clock source

CTRL_D0=1 Æ Cin1=32768 Hz clock source

The EN3 can be used to enable/disable the INT_CHAN_3 as following: (refer to

Sec. 3.3.4)

EN3=0 Æ INT_CHAN_3=disable

EN3=1 Æ INT_CHAN_3=enable

The INV3 can be used to invert/non-invert the Cout0 as following: (Refer to Sec.

3.3.6)

INV2=3 Æ INT_CHAN_3=inverte of (Cout2)

INV2=3 Æ INT_CHAN_3=non-inverte of (Cout2)

Refer to demo program for more information as following:

DEMO4.C Æ for INT_CHAN_3 only (Cout2)

NOTE: refer to Sec. 2.5.2 for active high-pulse generation.

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 16

2.6 Daughter Boards

2.6.1 OME-DB-37

The OME-DB-37 is a general purpose daughter board for D-sub 37 pins. It is

designed for easy wire connection.

2.6.2 OME-DN-37 & OME-DN-50

The OME-DN-37 is a general purpose daughter board for OME-DB-37 with DIN-Rail

Mounting. The OME-DN-50 is designed for 50-pin flat-cable header. Those boards are

designed for easy wire connection. Both have Din-Rail mounting.

37pin cable

OME-DN-37

2.6.3 OME-DB-8125

The OME-DB-8125 is a general purpose screw terminal board designed for ease of

wiring. There are one DB-37 & two 20-pin flat-cable headers in the OME-DB-8125.

37pin cable

OME-DB-8125

(OME-DB-37 or

20-pin flat-cable header)

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 17

2.6.4 OME-ADP-37/PCI & OME-ADP-50/PCI

The OME-ADP-37/PCI & OME-ADP-50/PCI are extender for 50-pin header.

One side of OME-ADP-37/PCI & OME-ADP-50/PCI can be connected to a 50-pin

header. The other side can be mounted on the PC chassis as following:

OME-ADP-37/PCI: 50-pin header to OME-DB-37 extender.

OME-ADP-50/PCI: 50-pin header to 50-pin header extender.

NOTE: The user can choose the suitable extender for his own applications.

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 18

2.6.5 OME-DB-24P/PD Isolated Input Board

The OME-DB-24P/DB-24PD is a 24-channel isolated digital input daughter board.

The optically isolated inputs of the OME-DB-24P/DB-24PD, consists of a bi-directional

opto-coupler with a resistor for current sensing. You can use the OME-DB-24P/DB-

24PD to sense DC signal from TTL levels up to 24V or use the DB-24P to sense a wide

range of AC signals. You can use this board to isolate the computer from large common-

mode voltage, ground loops and transient voltage spike that often occur in industrial

environments.

OME-PIO-D48

Opto-Isolated

OME-PIO-D48

50Pin cable

OME-DB-24P

AC or DC Signal

0V to 24V

+

-

OME-DB-24P OME-DB-24PD

50-pin flat-cable header Yes Yes

D-sub 37-pin header No Yes

Other specifications Same

OME-PIO-D48 User Manual, Sep/2000, V2.1 ----- 19