MT82Ag
(2D Scan Engine)
Integration Guide

INTRODUCTION

MT82Ag One-piece Compact 2D Scan Engine provides snappy scanning performance at a competitive cost and compact form factor. With its all-in-one design, the MT82Ag 2D  scan engine can be easily integrated with specific applications such as access control, lottery kiosk, and consumer electronics.
The MT82Ag 2D Scan Engine consists of 1 illumination LED, 1 aimer LED, and a high-quality image sensor with a microprocessor that contains powerful firmware to control all aspects of operations and enable communication with the host system over the standard set of communication interfaces.
Two interfaces, UART & USB, are available. UART interface communicates with the host system over TTL-level RS232 communication; the USB interface emulates a USB HID  Keyboard or Virtual COM port device and communicates with the host system over USB.

1-1. Block Diagram

1-2. Electric Interface
1-2-1. Pin Assignment

Pin#	CART	USB	I/O	Description	Schematic Example
1	NC	NC	————	Floating
2	VCC	VCC	————	Supply voltage input. Must always be connected to a 3.3V power supply.
3	GND	GND	————	Power and signal ground.
4	RDX	RDX	Input	UART TTL data input.

MT82Ag Scan Engine, Integration Guide, V0.7

Pin#	CART	USB	I/O	Description	Schematic Example
5	TXD	————	Output	UART TTL data output.
6	————	USB_D-	Bidirectional	USB Differential Signal Transmission (USB D-)
7	————	USB_D+	Bidirectional	USB Differential Signal Transmission (USB D+)
8	NC	NC	————	Floating
9	Buzzer PWM	Buzzer PWM	Output	Active High: it indicates the status of Power-Up or a successful barcode decoded. The PWM-controlled signal can be used to drive an external buzzer for a successful barcode decoded (Good Read).

Pin#	CART	USB	I/O	Description	Schematic Example
10	Good Read LED	Good Read LED	Output	When scanning is successful (Good Read), it outputs a high-level pulse, whose load capacity is limited and not enough to drive LED directly. A supporting LED drive for the circuit is required.
11	Reset	Reset	Input	Keeping a low level for at least 100us and returning to a high level or floating state, the scan engine restarts.
12	Trigger Input	Trigger Input	Input	High: Stop Scanning Low: Start Scanning   *Warning: 1. Pull low at power-up will prompt the scan engine into firmware update mode.	Once the trigger is pressed (pull low), the scanning operation continues until a barcode is successfully decoded or the trigger is released (pull high). To proceed to the next scanning operation, release (pull high) first and press (pull low) the trigger again. A minimum of 50ms interval is recommended between two trigger signals.

1-2-2. Electric Characteristics

Operating Voltage
Ta=25°C

Operating Current
Ta=25°C, VDD=3.3V

SPECIFICATIONS

2-1. Introduction
This chapter provides technical specifications of the MT82Ag. The operating method, scanning range, and scan angle are also presented.
2-2. Technical Specifications

2-3. Interface
2-3-1. UART Interface
Below are default communication protocols:
Baud rate: 9600
Data Bits: 8
Parity: None
Stop Bit: 1
Handshaking: None
Flow Control Timeout: None
ACK/NAK: OFF
BCC: OFF

Interface Configuration Barcode:	2-3-2. USB HID Interface Interface Configuration Barcode:	2-3-3. USB VCP Interface Interface Configuration Barcode:

2-4. Operation Method

1. At power-up, the MT82Ag sends the Power-Up signals over Buzzer and LED pins as an indication that the MT82Ag enters Standby Mode and is ready for operation.
2. Once the MT82Ag is triggered by either hardware or software method, MT82Ag will emit a beam of light that is aligned with the sensor’s field of view.
3. The area image sensor captures the image of the barcode and produces an analog waveform, which is sampled and analyzed by the decoder firmware running on the MT82Ag.
4. Upon a successful barcode decoded, the MT82Ag turns off the illumination LEDs, sending the Good Read signals over Buzzer and LED pins and transmitting the decoded data to the host.

2-5. Mechanical Dimension

(Unit = mm)

2-6. Connector Specification
Below is the recommended 12-pin 0.5-pitch FPC connector on the host side.

 INSTALLATION

The scan engine is designed specifically for integration into customers’ housing for OEM applications. However, the scan engine’s performance will be adversely affected or permanently damaged when mounted into an unsuitable enclosure.
Warning: The limited warranty is void if the following recommendations are not adhered to when mounting the scan engine.
3-1. Electrostatic Discharge Cautions
All scan engines are shipped in ESD protective packaging due to the sensitive nature of the exposed electrical components.

1. ALWAYS use grounding wrist straps and a grounded work area when unpacking and handling the scan engine.
2. Mount the scan engine in a housing that is designed for ESD protection and stray electric fields.

3-2. Mechanical Dimension
When securing the scan engine by utilizing the machine screws:

1. Leave sufficient space to accommodate the maximum size of the scan engine.
2. Do not exceed 1kg-cm (0.86 lb-in) of torque when securing the scan engine to the host.
3. Use safe ESD practices when handling and mounting the scan engine.

3-3. Window Materials
Following are descriptions of three popular window materials:

1. Poly-methyl Methacrylic (PMMA)
2. Allyl Diglycol Carbonate (ADC)
3.  Chemically tempered float glass

Cell Cast Acrylic (ASTM: PMMA)
Cell cast Acrylic or Poly-methyl Methacrylic is fabricated by casting acrylic between two precision sheets of glass. This material has very good optical quality but is relatively soft and susceptible to attack by chemicals, mechanical stress, and UV light. It is strongly recommended to have acrylic hard-coated with Polysiloxane to provide abrasion resistance and protection from environmental factors. Acrylic can be laser-cut into odd shapes and ultrasonically welded.
Cell Cast ADC, Allyl Diglycol Carbonate (ASTM: ADC)
Also known as CR-39TM, ADC, a thermal setting plastic widely used for plastic eyeglasses, has excellent chemical and environmental resistance. It also has an inherently moderate surface hardness and therefore does not require hard-coating. This material cannot be ultrasonically welded.
Chemically Tempered Float Glass
Glass is a hard material that provides excellent scratch and abrasion resistance. However, un-annealed glass is brittle. Increased flexibility strength with minimal optical distortion requires chemical tempering. Glass cannot be ultrasonically welded and is difficult to cut into odd shapes.

3-4. Window Placement

The distance between the window and front of MT82Ag should not exceed L=0.5mm
The thickness of the window should not exceed 1mm
3-5. Window Size

The window size should ensure that field of view is not blocked, and the illumination area should not be blocked as well. For the size of the window, please refer to the above diagram of each optical area.
3-6. Window Care
In the aspect of the window, the performance of MT82Ag will be reduced due to any kind of scratch. Thus, reducing the damage to windows, there are a few things that have to be noticed.

1. Avoid touching the window as much as possible.
2. When cleaning the window surface, please use a non-abrasive cleaning cloth, and then gently wipe the host window with the cloth that is already sprayed with glass cleaner.

REGULATIONS

The MT82Ag scan engine conforms to the following regulations:

1. Electromagnetic Compliance – CE EN55032/35
2. Electromagnetic Interference – FCC Part 15B Class B
3. Photobiological Safety – EN62471 (Exempt Group)
4. Environmental Regulations – RoHS 2.0, WEEE

 DEVELOPMENT KIT

MARSON MB120 Demo Kit (P/N: 11C0-5020000) enables the development of products and systems using the MT82Ag on the MS Windows OS platform. Besides the Multi  I/O board (P/N: 9014-2700000), the MB120 Demo Kit provides the software and hardware tools required for testing the MT82Ag applications before integrating them into the host device. Please contact your sales representative for ordering information.
MB100 Multi I/O Board (P/N: 9014-2700000)

PACKAGING

1. Tray (size: 24.7 x 13.7 x 2.7cm): Each tray contains 8pcs of MT82Ag.
2. Box (size: 25 x 14 x 3.3cm): Each Box contains 1pc of tray, or 8pcs of MT82Ag.
3. Carton (size: 30 x 27 x 28cm): Each Carton contains 16pcs of boxes, or 128pcs of MT82Ag.

VERSION HISTORY

Marson Technology Co., Ltd.
9F., 108-3, Mincyuan Rd., Sindian Dist., New Taipei City, Taiwan
TEL: 886-2-2218-1633
FAX: 886-2-2218-6638
E-mail: info@marson.com.tw
Web: www.marsontech.com

Documents / Resources

MARSON MT82Ag 2D Scan Engine [pdf] User Guide MT82Ag, 2D Scan Engine, MT82Ag 2D Scan Engine, Scan Engine, Engine

References

• User Manual