ADAM-4000系列智能数据采集模块用户手册

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"ADAM-4000系列是研华科技推出的一系列智能传感器到计算机接口模块，内置微处理器，能通过ASCII格式的简单命令进行远程控制，并使用RS-485通信协议。这些模块提供了信号调理、隔离、量程设定、A/D和D/A转换、数据比较以及数字通讯等功能。部分模块还配备了数字输入/输出线路，用于控制继电器和TTL设备。本用户手册详细介绍了ADAM4000系列数据采集模块的使用方法，包含了2018年版的版权信息，同时强调未经许可，不得复制或传播该手册内容。研华公司对其产品可能随时进行改进，并不对使用手册内容导致的侵权行为承担责任。此外，手册还提到了ADAM是研华公司的商标，以及其他相关产品的商标信息，并对产品提供两年质保。" 在ADAM-4000系列中，关键知识点包括： 1. **智能接口模块**：这些模块集成了微处理器，能够处理和解析来自传感器的数据，降低了与计算机系统的直接交互复杂性。 2. **ASCII命令**：通过ASCII码指令，用户可以方便地控制和配置ADAM-4000模块，这使得编程更为简单。 3. **RS-485通信协议**：这种协议允许模块在远距离和多设备网络中进行有效通信，具有良好的抗干扰性和可靠性。 4. **功能集成**：模块具备信号调理、隔离、量程设定、A/D和D/A转换等功能，一站式解决了数据采集和处理的需求。 5. **数字I/O线路**：部分模块提供数字输入/输出接口，可直接驱动继电器和TTL设备，增强了系统控制能力。 6. **版权和法律声明**：手册中的版权信息提醒用户需遵守使用条款，未经授权不得擅自复制或翻译。 7. **产品质保**：研华公司为其产品提供两年质保，确保了购买者的权益。 8. **品牌与商标**：ADAM是研华科技的商标，而IBM和PC是国际商业机器公司的商标，手册中提及了这些商标的归属。对于使用ADAM-4000系列的工程师或开发者来说，理解这些知识点是至关重要的，有助于他们有效地集成和利用这些模块进行数据采集和系统构建。

ADAM-4000 Series User Manual 2

1.1 Overview

The ADAM Series is a set of intelligent sensor-to-computer interface modules con-

taining built-in microprocessor. They are remotely controlled through a simple set of

commands issued in ASCII format and transmitted in RS-485 protocol. They provide

signal conditioning, isolation, ranging, A/D and D/A conversion, data comparison,

and digital communication functions. Some modules provide digital I/O lines for con-

trolling relays and TTL devices.

Software Configuration and Calibration

By merely issuing a command from the host computer, you can change an analog

input module to accept several ranges of voltage input, thermocouple input or RTD

input. All of the module’s configuration parameters including I/O address, communi-

cation speed, HI and LO alarm, calibration parameters settings may be set remotely.

Remote configuration can be done by using either the provided menu-based soft-

ware or the command set’s configuration and calibration commands.

By storing configuration and calibration parameters in a nonvolatile EEPROM, mod-

ules are able to retain these parameters in case of power failure.

Watchdog Timer

A watchdog timer supervisory function will automatically reset the ADAM modules in

the event of system failure. Maintenance is thus simplified.

Power Requirements

Although the modules are designed for standard industrial unregulated 24 V

power

supply, they accept any power unit that supplies power within the range of +10 to +30

. The power supply ripple must be limited to 5 V peak-to-peak, and the immediate

ripple voltage should be maintained between +10 and +30 V

Connectivity and Programming

ADAM modules can connect to and communicate with all computers and terminals.

They use RS-485 transmission standards, and communicate with ASCII format com-

mands. The command set for every module type consists of approximately ten differ-

ent commands.

The command set for input modules is larger because it incorporates alarm functions.

All communications to and from the module are performed in ASCII, which means

that ADAM modules can be virtually programmed in any high-level language.

RS-485 Network

The RS-485 network provides lower-noise sensor readings, as modules can be

placed much closer to the source. Up to 256 ADAM modules may be connected to an

RS-485 multi-drop network by using the ADAM RS-485 repeater which extends the

maximum communication distance up to 4,000 ft. The host computer is connected to

the RS-485 network with one of its COM ports through the ADAM-452x module (RS-

232 to RS-422/485 converter).

To boost the network’s throughput, ADAM RS-485 repeater uses a logical RTS signal

to manage the repeater’s direction. The only two wires that are needed for the RS-

485 network, DATA+ and DATA-, are inexpensive shielded twisted pair.

ADAM-4000 Series User Manual 6

This chapter provides guidelines to what is needed to set up and install an ADAM

network. A quick hookup scheme is provided that lets you configure modules before

they are installed in a network. To help you connect ADAM modules with sensor

inputs, several wiring examples are provided. At last, you will find a programming

example using the ADAM command set at the end of this chapter. Be sure to plan the

layout and configuration of your network carefully before you start. Guidelines

regarding layout are given in Appendix E: RS-485 Network.

2.1 System Requirements to Set up an ADAM

Network

The following list gives an overview of what is needed to setup,

install and configure an ADAM environment.

 ADAM modules

 A host computer, such as an IBM PC/AT compatible, that can output ASCII char-

acters with a RS-232C or RS-485 port.

 Power supply for the ADAM modules (+10 to +30 VDC)

 ADAM Series Utility software

 ADAM Isolated RS-232/RS-485 Converter (optional)

 RS-232/RS-485 ADAM Repeater (optional)

Host computer

Any computer or terminal that can output in ASCII format over either RS-232 or RS-

485 can be connected as the host computer. When only RS-232 is available, an

ADAM RS-232/RS-485 Converter is required to transform the host signals to the cor-

rect RS-485 protocol. The converter also provides opto-isolation and transformer-

based isolation to protect your equipment.

Power supply

For the ease of use in industrial environments, the ADAM modules are designed to

accept industry standard +24 V

, unregulated power.

Operation is guaranteed when using any power supply between +10 and +30 V

Power ripples must be limited to 5 V peak to peak while the voltage in all cases must

be maintained between +10 and +30 V

. All power supply specifications are refer-

enced at module connector. When modules are powered remotely, the effects of DC

voltage drops must be considered.

All modules use on-board switching regulators to sustain good efficiency over the 10

to 30 V input range; therefore, we can assume that the actual drawn current is

inversely proportional to the DC voltage.

The following example shows how to calculate the required current that a power sup-

ply should provide.

Assume that a +24 V

is used for five ADAM-4011 Analog Input Modules, and the

distance between modules and power supply is not significant enough to cause a DC

voltage drop. One ADAM-4011 module consumes a maximum of 1.2 Watts (W). The

total required power will equal to 5 x 1.2=6 W. A power supply of +24 VDC should

therefore be able to supply a minimal current of 6 / 24=0.25 Amps.

Small systems may be powered by using wall-mounted modular power supplies.

Also, when modules operate in long communication lines (>500 feet), it is often more

reliable to obtain power locally through modular power supplies. These inexpensive

units can be easily obtained from any electronic retail stores.

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