Datasheet > ELM624SM

ELM624SM

更新时间： 2024-11-23 10:07:59

品牌	Logo	应用领域
ELM		/
页数	文件大小	规格书
7页	47K
描述
CONTROL L TO RS232 INTERPRETER

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ELM624SM 数据手册

ELM624

Control L to RS232 Interpreter

Description

Features

The Control L or LANC interface is an industry

• Low power CMOS design

standard for many audio and video devices. It uses a

bit serial format that is similar to RS232, but differs

enough that devices cannot be directly connected to

one another. The ELM624 provides the necessary

logic to allow almost transparent transfer between

the two systems.

• High speed RS232 communications

• Configurable with standard AT commands

• ASCII output formatted as standard hex digits

• Minimum of external components required

• Most Control L formats supported

In operation, commands are sent to the ELM624

using an RS232 serial connection, translated to the

Control L format, and sent to the controlled device

on the LANC port. The resulting responses are then

converted to a series of ASCII characters and

transmitted back to the controlling serial device.

• External reset input for system use

• Crystal controlled for signal accuracy

This integrated circuit was designed to provide a

cost-effective way for experimenters to work with the

Control L system, so many features typically found in

commercial devices, such as RS232 handshaking,

variable baud rates, extra buffering of signals, etc.

have not been implemented. Responses are kept to

a minimum as well (eg. a single question mark is

returned for a misunderstood command), but the

general principles are demonstrated, and for many

applications, this is all that is required.

Connection Diagram

PDIP and SOIC

(top view)

VDD

XT1

VSS

LANC

XT2

Applications

reset

• Video editors

• Time-lapse recording controllers

• Remote camera controls

• Computer control of A/V equipment

VDD

Block Diagram

LANC

Control L

Interface

XT1

VSS

Master

Control

XT2

Oscillator

3.58MHz

RS232

Interface

VDD

reset

ELM624DSB

Elm Electronics – Circuits for the Hobbyist

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