IOtech micro488p schematic

™

230 PROGAMMABLE VOLTAGE SOURCE

Micro488/p

Up to 8

IEEE instruments

PC

IEEE 488

RS-232

Micro488/p

®

Miniature Serial/IEEE 488 Controller

Features

• Smallest serial to IEEE 488 controller available

• Controls up to eight IEEE 488 instruments

• Programmed with concise ASCII commands

• Requires no external power supply—powered

from the computer’s serial port

• Features standard DB25 serial and IEEE 488 connectors

• Enables remote control of IEEE 488 instruments

• Easily connects to notebook PCs

Not much larger than a standard IEEE 488 connector, the
Micro488/p™ is the smallest serial to IEEE 488 controller on the
market. Nonetheless, it features an on-board microcontroller,
permitting it to interpret commands received on its serial port and
to control as many as eight IEEE 488 instruments. Moreover,
because the Micro488/p derives its power from the host computer’s
serial port, it requires no external power connection.

The low-cost Micro488/p enables IEEE 488 control from any computer
equipped with a serial port

Because the Micro488/p’s firmware converts commands re­ceived on its serial port into IEEE 488 protocol, it does not
require that the host computer run special software. The host
computer must simply have the ability to send and receive ASCII
data via its serial port.

The Micro488/p attaches directly to the IEEE connector on the
back of an instrument, eliminating the need for an additional
IEEE cable. To control multiple instruments, you need only
connect the instruments with standard IEEE cables and attach
the Micro488/p to an open connector on any of the cables.

Specifications

Serial Interface

Electrical Characteristics: RS-232
Duplex: Full with echo/no-echo
Data Bits: 8-bit ASCII
Stop Bits: 1 or 2
Parity: none
Baud Rates: 300, 1200, 2400, 4800, 9600 and 19200, set automatically upon the receipt

of a carriage return from the host computer

Terminator: On Transmit, software configurable as LF, CR, LF-CR, or CR-LF; On

Receive, CR

Handshaking: Supports Clear To Send (CTS), Request To Send (RTS), and

XON/XOFF, software configurable

Serial I/O Buffers: 120-character input buffer
Connector: Accepts 25-Pin Sub-D male (DB25P)

IEEE 488 Interface

Controller Subsets: C1, C2, C3, C4, and C28
Terminator: Programmable for LF, CR, LF-CR, CR-LF, and EOI
Connector: Plugs directly into a standard IEEE 488 female receptacle, either

directly on an instrument or on a cable

Micro488/p System Example

The Micro488/p attaches directly to an instrument’s IEEE 488 connector

General

Power: Draws less than 5 mA from the DTR or DSR serial lines on the host

computer

Environment: 0˚ to 50˚C; 0 to 90% RH, non-condensing
Dimensions: 95 mm W x 58 mm D x 25 mm H (3.7” x 2.3” x 0.9”)
Weight: 50.2 g (1.8 oz)

IEEE 488 Interfaces & Support Products

tel: [phone] fax: [phone]

Ordering Information

Description Part No.
Miniature RS-232 to IEEE controller Micro488/p
Shielded IEEE 488 cable, 6 ft. CA-7-3
RS-232 cable, including adapter for 25- or 9-pin PC COM port, 6 ft. CA-35-6

For complete information on accessories and cables, visit

www.iotech.com/acc

318

[e-mail] www.iotech.com