Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com

System 50

CONTROLLERS

MicroDAC (Optomux)

FEATURES

• Each Unit Controls/Monitors up to

32 Analog (G5 Only) and/or Digital

I/O Modules

• Executes On-Board Programs

Created With Borland C

• Network up to 64 MicroDACs per

Host Serial Port, Each Separated

by as Much as 4000 Feet

• Communicate Over RS-422/485 at

Speeds From 1200 Bd to 115.2 KB

Expanded Command Set

• I/O Update Rates of 500 µSec per

32 Digital I/O, and 10 mS per

Analog Input or 2 Analog Outputs

• BASIC and C Drivers for the PC

• DIN Rail or Panel Mountable Metal

Enclosure

• Hardware Expansion With SBX Port

• Real Time Clock Option (Y2K

Compliant)

ANALOG & DIGITAL I/O

A 50 conductor ribbon cable is supplied to connect

MicroDACs to any 8,16,24, or 32 module

mounting rack. If connected to a G5 rack, any

combination of analog and digital I/O modules

racks permit only a combination of digital modules.

MicroDACs can be networked to a PC which

runs programs that monitor the input signals and

control the outputs. In addition to simple ON/OFF

instructions, commands are included which

permit you to:

• Sample analog signals at 10 mS per input

• Flag values above or below prescribed levels

• Capture min/max values

• Calculate the average input signal levels

• Provide linearized thermocouple and

RTD temperature values

• Determine the width of input pulses

• Count pulses at frequencies up to 1000 Hz

• Detect rising or falling edges

• Latch momentary input events

• Set the level of analog outputs

• Provide delayed-on or delayed-off outputs

COMMUNICATIONS

The host PC and MicroDAC(s) communicate

serially over one or two pair of twisted wires per

RS-422/485 in either a multi-drop or repeat

to code the command and the response

messages. Application programs running on the

host PC issue commands and then await

responses

from

the

MicroDAC.

The

communications speed is selectable between

1.2 and 115.2 KBaud. Each controller on the

network is assigned a unique base address. You

can separate units from one another by as much

as 4,000 feet.

EMBEDDED CONTROL

PROGRAMS

By specifying MicroDAC(s) with the optional

64KB of flash memory, you can develop and

download C language programs to any of the

networked controllers.

Even while an Embedded Control Program (ECP)

command it receives from the host will be

processed as usual, which allows you to delegate

some or all of the control and data acquisition

responsibility from the host PC. This reduces

communications time and improves system

response.

For embedded or stand-alone applications,

downloaded ECP routines can be initiated on

power-up. Where redundant control or process

shutdown procedures are vital, ECP initiation can

be tied to the communications watchdog timer. In

the event the host computer goes off line, the ECP

automatically begins executing.

Libraries and the appropriate download utility are

included with the ECP Programmers Manual.

SOFTWARE

Software drivers are available which simplify the

task of interfacing host programs written in Visual

Basic or C. Sample programs, set-up and debug

utilities are included on the disk with the drivers.

Interface drivers for most third party software

packages are available through their distributors.

Our MicroDAC DDE Server dramatically

simplifies data sharing between MicroDACs and

Windows applications, such as Microsoft Excel

(see Optomux Software). Our DLL will assist you

in building custom Windows Man-Machine

Interfaces or control programs using Visual Basic,

OTHER FEATURES/OPTIONS

The RS-232 serial port provides a connection for

remote RS-232 devices. You can use this port to

read information from input devices such as bar

code readers or keyboards or to write information

to output devices such as operator interfaces,

intelligent displays or printers.

The optional real time clock permits ECP routines

to be executed based on date or time of day. It

also allows data that is collected to be time

stamped and stored in battery backed RAM

memory.

Stand Alone Control

Local Control & I/O

Remote I/O

Distributed I/O

SCADA

RTU

APPLICATIONS

System 50

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