RT214 2D Barcode Reader
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Product Specifications
- Model: RT214
- LED: White LED for illumination, Red LED aimer
- Operating Temperature: Refer to user manual for details
- Storage Temperature: Refer to user manual for details
- Humidity: Refer to user manual for details
Product Usage Instructions
1. Illumination
The RT214 is equipped with a white LED for supplementary
lighting, allowing barcode scanning in low-light conditions. This
feature can be toggled On or Off based on your requirements.
2. Aimer
The device includes a red LED aimer to assist in aligning the
barcode within the field of view for efficient scanning. It is
recommended to enable the aimer for regular barcode scanning.
However, in scenarios with varying background colors or strong
light, consider turning off the aimer for optimal performance.
3. Installation
When installing the RT214, avoid touching the imaging lens to
prevent fingerprint marks. Exercise caution when handling the
illumination LED to prevent damage. Ensure proper ESD protection
and dust prevention measures are in place.
4. Mounting
Refer to the mechanical mounting dimensions provided in the user
manual for correct installation of the RT214.
5. Housing Design
The RT214 utilizes a sophisticated optical system. Proper
housing design and selection of window material are crucial to
maintain performance. Follow guidelines for window placement and
material selection.
Frequently Asked Questions (FAQ)
Q: Can the illumination and aimer features be customized?
A: Yes, both the illumination and aimer functionalities can be
programmed to suit specific requirements.
Q: What precautions should be taken during installation?
A: Avoid touching the imaging lens or illumination LED, ensure
ESD protection, and maintain a dust-free environment for optimal
performance.
Q: What is the recommended window material for the RT214?
A: Clear cell-cast plastics or optical glass are recommended.
PMMA and chemically tempered glass are suitable options. Ensure the
window material meets specifications outlined in the user
manual.
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RT214 Integration Guide
RT214 Integration Guide
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RT214 Integration Guide
Contents
Introduction …………………………………………………………………………………………………………………………………………………………………… 2 Illumination …………………………………………………………………………………………………………………………………………………………………… 3 Aimer ……………………………………………………………………………………………………………………………………………………………………………. 3 Introduction …………………………………………………………………………………………………………………………………………………………………… 4 General Requirements ……………………………………………………………………………………………………………………………………………………… 4
ESD ………………………………………………………………………………………………………………………………………………………………………..4 Dust and Dirt ………………………………………………………………………………………………………………………………………………………….. 4 Ambient Environment ……………………………………………………………………………………………………………………………………………….4 Thermal Considerations ……………………………………………………………………………………………………………………………………………. 5 External Optical Elements …………………………………………………………………………………………………………………………………………. 5 Mounting ………………………………………………………………………………………………………………………………………………………………………..6 Housing Design ………………………………………………………………………………………………………………………………………………………………. 7 Optics …………………………………………………………………………………………………………………………………………………………………………….7 Window Placement ………………………………………………………………………………………………………………………………………………….. 7 Window Material and Color ………………………………………………………………………………………………………………………………………..8 Coatings and Scratch Resistance ………………………………………………………………………………………………………………………………….9 Window Size …………………………………………………………………………………………………………………………………………………………. 10 Roll, Skew and Pitch ……………………………………………………………………………………………………………………………………………….. 11 Ambient Light ……………………………………………………………………………………………………………………………………………………….. 12 Eye Safety …………………………………………………………………………………………………………………………………………………………….. 12 Power Supply ……………………………………………………………………………………………………………………………………………………………….. 13 Ripple Noise …………………………………………………………………………………………………………………………………………………………………. 13 DC Characteristics …………………………………………………………………………………………………………………………………………………………. 13 Operating Voltage ………………………………………………………………………………………………………………………………………………….. 13 I/O Voltage …………………………………………………………………………………………………………………………………………………………… 17 Timing Sequence …………………………………………………………………………………………………………………………………………………………… 18 Power Up Timing Sequence ………………………………………………………………………………………………………………………………………18 Interface Pinouts …………………………………………………………………………………………………………………………………………………………… 21 External Circuit Design …………………………………………………………………………………………………………………………………………………… 22 Good Read LED Circuit ……………………………………………………………………………………………………………………………………………. 22 Beeper Circuit ……………………………………………………………………………………………………………………………………………………….. 22 EVK …………………………………………………………………………………………………………………………………………………………………………….. 24
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RT214 Integration guide
Introduction
The RT214 is an area image engine for barcode reading. It includes an illumination LED and an aiming LED. LED Compliance Statement The RT214 complies with IEC 62471:2006 for LED safety. The RT214 contains: ·a CMOS image sensor and its lens ·an LED based illumination system ·an LED aiming system
Figure 1-1 System Block Diagram
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RT214 Integration guide
Illumination
The RT214 has a white LED for supplementary lighting, making it possible to scan barcodes even in complete darkness. The illumination can be programmed On or Off.
Aimer
The RT214 contains a red LED aimer to help the user to easily position the target barcode within the engine’s field of view to increase scan efficiency. The aiming pattern can be turned On or Off. It is advisable to turn it on when scanning barcodes in regular circumstances. For applications in the background of different materials and colors or in the strong light or backlight environment, it is advised to turn off the aimer.
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Introduction
This chapter explains how to install the RT214, including general requirements, housing design, and physical and optical information.
Caution: Do not touch the imaging lens when installing the engine. Be careful not to leave fingerprints on the lens. Caution: Do not touch the illumination LED during handling. Improper handling may damage the LED.
General Requirements
ESD
ESD protection has been taken into account when designing the RT214. However, due to limited board space, additional ESD protection, such as TVS protection, is not provided on the engine’s I/O interface. It is advised to take corresponding protection measures when integrating the engine. The engine is shipped in ESD safe packaging. Always exercise care when handling the engine outside its package. Be sure grounding wrist straps and properly grounded work areas are used.
Dust and Dirt
The RT214 must be sufficiently enclosed to prevent dust particles from gathering on the lens and circuit board. Dust and other external contaminants will eventually degrade the engine’s performance.
Ambient Environment
The following environmental requirements should be met to ensure good performance of the RT214.
Table 2-1 Operating Temperature Storage Temperature Humidity
-20°C to 55°C -40°C to 70°C 5% ~95% (non-condensing)
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RT214 Integration guide
Thermal Considerations
Electronic components in the RT214 will generate heat during the course of their operation. Operating the RT214 in continuous mode for an extended period may cause temperatures to rise on CPU, CIS, LEDs, DC/DC, etc. Overheating can degrade image quality and affect scanning performance. Given that, the following precautions should be taken into consideration when integrating the RT214. Reserve sufficient space for good air circulation in the design. Avoid wrapping the RT214 with thermal insulation materials such as rubber.
External Optical Elements
Do not subject external optical components on the engine to any external force. Do not hold the engine by an external optical component, which may cause the mechanical joints that secure the components to crack or break due to excessive stress.
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Mounting
The illustrations below show the mechanical mounting dimensions (unit: mm) for the RT214.
RT214 Integration guide
Note: Tolerance of dimension is ±0.15mm.
Figure 2-1
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RT214 Integration guide
Housing Design
Note: Conduct an optical analysis for the housing design to ensure optimal scanning and imaging performance. Housing design should make sure that internal reflections from the aiming and illumination system are not directed back to the engine. The reflections from the housing or window can cause problems. Avoid any highly reflective objects around the engine that can cause bright spots to appear in the captured image. It is recommended to use baffles or matte-finished dark internal housing colors.
Optics
The RT214 uses a sophisticated optical system. An improperly designed internal housing or improper selection of window material can degrade the engine’s performance.
Window Placement
The window should be positioned properly to let the illumination and aiming beams pass through as much as possible and no reflections back into the engine (reflections can degrade the reading performance of the engine). There are two window placement options. · Parallel window Primary option for imager engines. The following window distance requirements should be satisfied: The maximum distance is measured from the front of the engine housing to the furthest surface of the window. In order to reach better reading performance, the distance from the front of the engine housing to the nearest surface of the window should not exceed a (a=0.1mm) and the distance from the front of the engine housing to the furthest surface of the window should not exceed a+d (a=0.1mm, d=2mm), as shown in Figure 2-2. · Tilted window – This option is for laser/imager engines. For the tilted window distance requirements, please see Table 2-2.
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RT214 Integration guide
Figure 2-2
Table 2-2
Minimum Angle (Tilted Window)
Uncoated, minimum window positive tilt (+w) Uncoated, minimum window negative tilt (-w)
Distance from the front of the engine housing (b)
10mm
15mm
20mm
35°
30°
28°
Window Material and Color
Window material must be clear. Use only cell-cast plastics or optical glass. PMMA and chemically tempered glass are recommended. Window material selected for the engine should meet or exceed the specifications specified in Table 2-3. When using a clear plastic window, it is recommended to apply anti-reflection (AR) coating on it.
· PMMA (Cell-cast acrylic): When fabricated by cell-casting, has very good optical quality and low initial cost, but surface must be protected from the environment due to its susceptibility to attack by chemcials, mechanical stresses, and UV light. Reasonably good impact resistance.
· Chemically tempered glass: Glass is a hard material which provides excellent scratch and abrasion resistance. But unannealed glass is brittle. Increased flexibility strength with minimal optical distortion requires chemical tempering. Glass is hard to be cut into odd shapes and cannot be ultrasonically welded.
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Table 2-3 Specification
Spectral Transmittance Thickness
Light Wavelength Clear Aperture Surface Quality
Description
90% (PMMA) 91% (Chemically tempered glass) 0.5-2.0mm 400-780nm
1.0mm to edges 60-20 scratch/dig
Pay extra attention to the light wavelength when using plastic materials. Colored windows are not recommended if the engine is used to scan barcodes on moving objects.
Coatings and Scratch Resistance
Scratch on the window can greatly reduce the performance of the RT214. It is suggested to use abrasion resistant window material or coating. The following introduces two commonly-used types of coatings: · Anti-reflection coatings: Anti-reflection (AR) coatings can be applied to window surfaces to reduce reflected light from the window back into the engine. Multi-layer AR coatings on windows help to achieve less than 0.5% reflectance and covered wavelength is 400-780nm.
· Scratch resistance coatings: Scratch resistance coatings require a degree of greater than 5H in its hardness. Coatings can be applied to plastic surfaces to increase the surfaces’ abrasion and scratch resistance. Both tempered glass and plastic windows can be AR coated. However, it is easier and more cost-effective to put an AR coating on the glass than on the plastic. The AR coating specifications below should be met when using an AR coated window. Single side AR coating: 93% minimum transmittance within spectrum range from 400 nm to 780 nm. Double side AR coating: 97% minimum transmittance within spectrum range from 400 nm to 780 nm.
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RT214 Integration guide
Window Size
The window must not block the field of view and should be sized to accommodate the aiming and illumination envelopes shown below.
Horizontal:
Figure 2-3
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RT214 Integration guide
Vertical:
Figure 2-4
Figure 2-5
Roll, Skew and Pitch
Three different reading angles, roll, skew and pitch are illustrated in Figure 2-6. Roll refers to rotation around the Z axis, skew to rotation around the X axis and pitch to rotation around the Y axis. For the engine’s technical specifications, please visit the RTscan website or contact your dealer.
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RT214 Integration guide
Figure 2-6
Ambient Light
The RT214 shows better performance with ambient light. However, high-frequency pulsed light can result in performance degradation.
Eye Safety
The RT214 has no lasers. It uses LEDs to produce illumination beam. The LEDs are bright, but testing has been done to demonstrate that the engine is safe for its intended application under normal usage conditions. However, the user should avoid looking into the beam.
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RT214 Integration guide
Power Supply
Do not power up the RT214 until it is properly connected. Be sure the power is cut off before connecting a cable to or disconnecting a cable from the host interface connector. Hot-plugging could damage the engine. Unstable power supply or sharp voltage drops or unreasonably short interval between power-ons may lead to unstable performance of the engine. Do not resupply the power immediately after cutting it off. When designing, the user should ensure that the input power of RT214 is fully decoupled. It is recommended to place a 22uF and a 100nF X5R or X7R ceramic capacitor beside the power input pin on the connector which is soldered on the board. The capacitor mounted on the external input power supply is recommended to be controlled within 50uF. Ensure that the input power drops below 0.5V before powering the RT214 on again, otherwise it will lead to abnormal function.
Ripple Noise
To ensure the image quality, a power supply with low ripple noise is needed. Acceptable ripple range (peak-to-peak) :100mV
DC Characteristics
Operating Voltage
Table 3-1 T=25°C
Parameter VDD
Description Input Voltage
Operating Current
Table 3-2 T=25°C
Description Working Current Standby Current
State VDD=3.3V
Minimum 3.14
Typical
Maximum
Unit
3.3
3.47
V
PEAK 240
–
RMS
Unit
138
mA
11.8
mA
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RT214 Integration guide
Working Current Figure 3-1
Working CurrentAimer off Figure 3-2
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RT214 Integration guide
Working CurrentIllumination off Figure 3-3
Max Impulse Current When Powered On Figure 3-4 15
RT214 Integration guide
The max impulse current (439mA) when powered on is shown in Figure 3-4. It is recommended that the external VDD should provide at least a current of 500mA. Ensure that Rdc of the cable is controlled within 0.35 by shortening FPC cable, increasing power line and ground line width, etc. Avoid using long cables to connect the RT214. Power consumption will result in abnormal function.
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I/O Voltage
Table 3-3 VDD=3.3 V, GND =0 V, T=25°C
Parameter
Condition
Minimum
Typical
Maximum
Unit
VIL
Except nTRIG pin
–
–
0.8
V
VIH
Except nTRIG pin
2
–
–
V
VIL(1)
Only nTRIG pin
–
–
VIH(1)
Only nTRIG pin
2.9VDD-0.4
–
VOL
Iol= 4mA~16mA
–
2.2 (VDD-1.1)
V
–
V
0.4
V
VOH
Ioh= 4mA~16mA
2.4
–
–
V
Note: The high and low level threshold of nTRIG is related to the external voltage VDD. The input low level VIL of nTRIG should be below VDD-1.1, and the input high level VIH should be above VDD-0.4.
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Timing Sequence
Power Up Timing Sequence
VDD BUZ TXD RXD USB_D+ USB_DnTRIG nRST
215ms
25ms 5ms
ED A
B
185ms C
Figure 3-5
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RT214 Integration guide
1. In the diagram above, it takes A+B+C (about 215ms) for the engine to power up: A is bootloader execution time (25ms), B is kernel boot time (5ms) and C is decoding chip initialization time(185ms).
2. D is reset time (300us). If the Reset signal is not operated when powered on, the startup time should be calculated after VCC_3V3 reaches 3.3V.
3. Ensure that all communication interface data has been transmitted before powering off. 4. The RT214 has a 100K pull-up on the nTRIG signal. During the period between power-on and bootloader execution,
the user should not lower the nTRIG signal. If nTRIG is set high before power-on, it should meet the duration of E (E=0~1ms) as shown in Figure 3-4. Levels of other signals are kept low during power-on to prevent abnormal function.
Power Up Timing Sequence (Serial Interface) Figure 3-6
Power Up Timing Sequence(USB) Figure 3-7 19
RT214 Integration guide
Power Down Timing Sequence
VDD TXD RXD USB_D+ USB_DnTRIG nRST
Figure 3-8 Note: When powering down the RT214, cut off the power and ensure levels of TXD, RXD, USB_D+, USB_D-, nTRIG and nRST signal are kept low.
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Interface Pinouts
The RT214’s FPC comes out with 12pins to host:
RT214 Integration guide
12-pin definition of pinout of RT214:
PIN1 PIN12
PIN#
Signal Name
I/O
1
NC
–
2
VDD
–
3
GND
–
4
RXD
I
5
TXD
O
6
USB_D-
–
7
USB_D+
–
8
NC
–
9
BUZ
O
10
LED
O
11
nRST
I
12
nTRIG
I
State –
Function –
3.3V power input Power-supply ground TTL level 232 receive data TTL level 232 transmit data
USB_D- signal USB_D+ signal
Beeper output Good Read LED output Reset signal input Trigger signal input
Note: please remember your device’s TXD should be connected to RXD of RT214, and RXD to TXD.
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RT214 Integration guide
External Circuit Design
Good Read LED Circuit
The circuit below is used to drive an external LED for indicating good read.
Figure 5-1
Beeper Circuit
The circuit below is used to drive an external beeper.
Figure 5-2 22
RT214 Integration guide
Trigger Circuit
The circuit below is used to provide the engine with a signal to trigger a scan and decode session. The host can adjust the external circuit and its functions based on actual applications. R1 is recommended as 10K-100K and R2 as 33. C1 is used to eliminate the vibration of mechanical keys. Generally, 1nF-10nF ceramic capacitors are recommended. When ESD protection is required, ESD protector can be added to the external circuit like ED1 shown as below. When using the external IO port as a trigger output, note that high and low levels must meet the requirements provided in Table 3-3. It is recommended to use the default floating or default pull-up IO port as the trigger pin. If you can only use the default pull-down IO port as the trigger pin, refer to the power-on timing sequence in Figure 3-5. When not triggered, ensure that the pin meets the high level requirements inTable 3-3.
Figure 5-3
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EVK
The EVK is provided to help users to test and evaluate the RT214, which contains beeper & beeper driver circuit, LED & LED driver circuit, and trigger, TTL-232 to RS-232 converter, RS-232 or USB interfaces, reserved signal debugging interface, etc.
For Any Technical Support, please contact us at: support@rtscan.net
RT214 Integration guide
Documents / Resources
 |
RTscan RT214 2D Barcode Reader [pdf] Installation Guide RT214_Integration_Guide_12pin, RT214_Integration_Guide_12pin_2025_4, RT214 2D Barcode Reader, RT214, 2D Barcode Reader, Barcode Reader, Reader |