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Scanners & Badge Readers | Radio Frequency Terminals   


Scanners & Badge Readers
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Q. What is the difference between keyboard wedge and RS-232 interfaces?

A: For a keyboard wedge interface, the scanner or reader (decoder built in) connects to the keyboard port of computer, the keybard will connect to the split cable of scanner and remains fully functional. The data scanned from a bar code symbol is treated as it is typed in from the keyboard.

For RS-232 interface, the scanner or reader connects to a serial port and transmits serial data to the host machine. The host must be set up to receive serial data. The RS-232 scanner or reader can be programmed for a variety of baud rates, data bits and parity in order to communicate properly with host machine.

Q. What is depth of field?

A: The variation in distance that a bar code can be read from a scanner is called depth of field.

Q. What is the difference between Visible and Infra-red scanners (Readers)?

A: The light source of scanner or reader in most cases is at around 660 nanometres wavelength, which can be seen by our eyes, this is the type of scanner of reader that comes with Vissible Light; alternately, some scanners or reader may have light source around 940 nanometres wavelength, which is beyond the spectrum that eyes can see, we call such scanner Inra-red scanner.

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Q. I have a high density bar code label, can it be read with regular scanners?

A: Some labels may print with very high density bar code, such as 4 mil (0.10mm), and most scanners may only read up to 5 mil (0.125mm) code. In which case, please contact us, we have high density scanner for that purpose.

Q. I can not read bar code symbol every time with my Wand Reader

A: Try to hold the wand like holding a pen, with 14 to 30 degree angle, scan the bar code label with a natrual way from either left to right or to left.

Q. The scanner reads some labels, but do not read the others.

A: Usually the readers or scanners have default settings to read certain types of bar code symbologies like UPC, EAN, Code 30...etc., and some other symbologies like Interleave 2 of 5, Industrial 2 of 5 are not set up in default to be read. So, find out the what type of bar code symbology that can not be read, if it is the type of symbology that was not set up to be read, follow the programming menu to set up ON and you should be able to read it.

If the labels are the same type of symbology, but some can be read, and some can not be read, then please esamine if the labels are printed well and clean, which may be the cause that decoder in scanner is not capable recognizing the bar code symbols.

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Q. I hear the scanner reading tone, but I do not see data on screen.

A: This is usually happened while the interface setting in scanner does not match the input expectation of application software. For instance, if the interface setting is set as RS232, and the scanner does connect to RS232, but your application software is expecting the data entries from keyboard port, then when you scan the bar code symbol, you will hear the decoding tone, but you won't see the scanning result on screen, vise versa.

Q. I can not make scanner work with my notebook computer through keyboard wedge.

A: There is a possibility that your scanner can not work with notebook computer you have through keyboard wedge, the reason for this problem is some notebooks are detecting the exist of keyboard, and if they are supposed to recognize keyboard only, not other devices like scanners. In this case , please contact us, we have scanners with decoder version that can deal with such problem.

Q. What is the maximum length cable to transmit valid data through scanner?

A: For keyboard wedge model, on typical PC, the distance is about 9 feet. For RS232, EIA standard is 50 feet, WA is typically offers 9 feet or 15 feet. On Wand Emulation model, it is 7 feet or 15 feet.

To use with scanner beyond the typical rande, please call or email us for possible solutions.
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Q. What is Postamble?

A: In some cases, you may want to add character(s) trailing the bar code symbol scanned in and send to the host computer, we call this Postamble. Please follow the steps in the programming menu for this function.

Q. What is Preamble?

A: In some cases, you may want to add character(s) in front of the bar code symbol scanned and send to the host computer, we call this Preamble. Please follow the steps in the programming menu for this function.

Q. Do I need a power supply?

A: The need for power supply depends on the host machine. For regular PC, if scanner is keyboard wedge interface, then you do not need power supply; but if scanner comes with RS232 interface, then you need a power supply. Please refer to the product menu for appropriate power supply should be used.

Q. How do I truncate the leading and trailing character(s) of a bar code?

A: This happens mostly in UPC symbology, the leading character in UPC called a number system digit, and the trailing character is a check character. In the programming menu, follow the procedure to truncate either or both characters.

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Q. What are Track 1, Track 2 and Track 3 in Magnetic Swipe badge?

A: On Magnetic Stripe badge or card, based on the positions with stripe, there are information stored in these different positions which are called Track 1, Track 2 and Track 3.

Track one is a "track" of information that has a 79 characters alphanumeric field of information.

Track two is a "track" of information that has 40 characters field for information.

Track three is a "track" of information that has 107 characters field for alphanumeric information.

Credit card contains information on both Track 1 and Track 2.

Q. I have Magnetic Swipe Reader, but I can not read the badges I have.

A: Please check which track the badge contains information. Make sure your Magnetic Stripe Reader is capable reading the information in that track. For instance, if you have a badge contains information on Track 1, 2 and 3, and you have a dual track (1, 2 or 2, 3) reader, you won't be able to read that badge for sure.

If you have a Dual Track reader, it may be set up to read dual track (1, 2 or 2, 3) badge only, in which case, if you have a single track badge, you won't be able to read it neither. But you can re-programming the reader to read ALL tracks. In dual track reader case, that means if it is Track 1 & 2 reader, it may read badge contains information only on track 1 or track 2.

Q. How do I program my Bar Code Slot Reader parameters?

A: The decoder built in Slot Reader comes with a side port and an extension cable (din 9), which allows user to use other nondecoded bar code scanners (TTL) as tools and follows the programming menu to program parameters if it is necessary.

Q. I can not read my bar code badges with the Bar Code Slot Reader.

A: Please check the position of bar code printed on badge. Sometimes, the bar code symbol is located too low or too high beyond the range the optical sensor's reading range.

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Radio Frequency Terminal and Modules
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Q. What is the difference between the Extended Range and Standard Range UniLinks?

A:  The standard range product (200 feet) is an internal ceramic antenna. It gives a donut shaped range of about 200 feet. All current UniLinks ships with the three inch antenna and have a range of about 500 feet.

Q. Will the UniLinks ever support the 19.2 kbps data rate?

A:  The units shipping today are 9600 baud. The 19.2 Kpbs is in R&D and is a long term future product to be released in 1999.

Q. Does the device need to be configured using proprietary software?

A: The units do come with Setup software and we can proide an OEM control pack under certain instances.

Q. Can one transceiver commnicate with multiple reansceivers?

A: Yes via the ADDRESS-NET software.

Q. How is the User Assignable address assigned to a transceiver?

A:  Each unit has built into it.. a unique serial number. When multiple transceivers exist within a specified area, the DDRESS-NET software will let the user pick and choose between specific transceivers. You will also have the "ability" to ship units from point A to Point B with UniLink transceivers preconfigured by a reseller/factory.
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Q. Will the transceiver work in an environment where a Spread Spectrum Radio Network is using the same frequency? If so, how does it work?

A:  All radios interfere with other radios on the same frequency. This is where our ACK/NACK comes into being. If data is not received than the UniLink requests re-transmission. Collision avoidance and integrity of the received data packets is insured by using both a proactive approach followed by data integrity tests and finally employing error recorvery techniques. The UniLink transceivers first proactively listen for "Clear Air" to determine if the selectd frequencies are free of carrier activity. The transmitting Communications Processor then inserts Longitudinal Check Digits into each data packet stream to assure data packet integrity at the receiver. If the check digit received does not match the calculated value of the received data, the receiving Communications processor demands additional transmission retries from the transmmitting UniLink using ACK/NACK handshaking until a confirmed valid data packet is received.   The number of retry attempts is programmable by the User during initial options setup using hte ADDRESS-NET software.

Q. What is the transmit power output?

A: We put out a max of one (1) milliwatt which is the legal max without a FCC license here in the United States.

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