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ADC module Lnet tm and LabNET tm - Laboratory ADC Network

Laboratory Network developed by NAS Ltd and based on industrial standard RS-485. It is ideal for industrial and laboratory applications. Minimum of connections but maximum of suitability and convenience. To one PC can be connected up to 16 Lnet devices. Lnet firmware based on standard microcontroller i80C51.

ADC module Lnet - entered in state registry of measuring devices

Simple and inexpensive 24-bit two-channel ADC block with number of features, which other products do not have at all:
Unique connectivity to any type of GC equipment achieved using built in ADC Lnet precision input voltage and current amplifiers. ADC LabNET can be connected directly to ionisation detectors and make extermely wide dynamic range.
Input noise level is: 1·10-14 A and 0.3 mkV respectively. Amplifiers gain switching carried out automatically under microprocessor control. It allows acquire component concentration in range from 0.00001% to 100% without manual intervention. Blocks can be chained together with simple telephone wire and form the acqusition network with up to 32 measuring channels. The entire network is connected to single RS-232 port without any additional interface converters. The total segment lenght of measurement network can be up to 100 meters (300 ft).

ADC characteristics
Number of channels 2 channels. Available the following order options:
2 voltage channels (U+U option),
1 low-current, 1 volatage channel (I+U option - standard),
2 low-current channels (I+I option)
Type / ADC resolution Sigma-delta ADC AD 7710 / 24 bit
Effective resolution

22-24 bits (at sampling rate of 10 Hz)
Note 1: Low-current channel utilise automatic range switching, so the total dynamic range 107 would be:
log2(107) = true 24 bit
Note 2: Voltage channel also use the internal gain switching to obtain maximal resolution performance.
log2(6V / 0.3mkV) = true 24 bit

Low current Input signal range - 2.5x10-7 - +2.5x10-7 A
Voltage input signal range ± 3.0 V
Data sampling rate, maximal 50 Hz
Synchronisation External contact closure or top button start
Input protection ± 15 V

Microcontroller
Type AT89C51
Data RAM 128 bytes
Code ROM 4 kbyte
Data exchange method 1 RS-232 Serial port, data rate 57600 bps
5 m (15 ft) cable
galvanic decoupling
Data exchange method 2

RS-485 LabNET bus, data rate 57600 bps
up to 100 m (300 ft) with termination, up to 16 modules on bus
galvanic decoupling

Data exchange method 3 NEW !!!

10/100 Ethernet network. TCP/IP protocol.
Each box has its own IP address. IP address can be set using DHCP / bootp method or using the configuration utility.

Power supply
Current reqirements

220V, 30 mA. European 3-cord power outlet.

110V, 60 mA - upon special order.

Dimensions
Housing Steel housing (1 mm), ruggedised for industrial application.
Size 240x120x75 mm (brick size)

Please,  Look at ADC Lnet sample

The deployment of LabNET network in industrial environment