Tres 900s User manual

tres900s
Operations Manual
Revision A – 6/21/2019

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Table of Contents
PRODUCT DESCRIPTION ........................................................................................................ 1
SCOPE ........................................................................................................................................... 1
SUMMARY .................................................................................................................................... 1
PRODUCT IDENTITY ...................................................................................................................... 1
REFERENCE DOCUMENTS ............................................................................................................. 1
REVISION HISTORY ....................................................................................................................... 1
PRODUCT OPERATIONS ......................................................................................................... 2
HARDWARE DESCRIPTION ............................................................................................................ 2
READER ........................................................................................................................................ 2
TAGS ............................................................................................................................................ 2
WIEGAND INTERFACE ................................................................................................................... 3
SERIAL RS232/RS485 .................................................................................................................. 3
TRIGGER MODE ............................................................................................................................ 3
POWER REQUIREMENTS ................................................................................................................ 3
RELAY DESCRIPTION .................................................................................................................... 3
SOFTWARE DESCRIPTION ..................................................................................................... 3
OPTION FEATURE ......................................................................................................................... 4
DEFAULT TRES900S SETTINGS ...................................................................................................... 4
CONNECTING TO TRES900S................................................................................................... 4
WIRING DIAGRAM ........................................................................................................................ 4
LED Control ............................................................................................................................. 5
RS232 Control .......................................................................................................................... 5
RS485 Control .......................................................................................................................... 5
Earth ......................................................................................................................................... 5
Power Connect ......................................................................................................................... 5
Relay Control ........................................................................................................................... 6
Trigger Control ........................................................................................................................ 6
Wiegand Control ...................................................................................................................... 6
TRES900S INTERFACE SETUP PROGRAM ......................................................................... 6
UPPER LEFT TOOLS ...................................................................................................................... 7
CONTROL SECTION ....................................................................................................................... 7
Comm ....................................................................................................................................... 7
Reader Interface Actions .......................................................................................................... 7
RF Section ................................................................................................................................ 8

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Reader section .......................................................................................................................... 8
Serial Comm Section ................................................................................................................ 8
Wiegand Section ....................................................................................................................... 9
IDs Section ............................................................................................................................... 9
Relay ....................................................................................................................................... 10
INDICATORS ............................................................................................................................. 10
LOG WINDOW .......................................................................................................................... 10
SPECIFICATIONS..................................................................................................................... 11
READER INSTALLATION GUIDE ........................................................................................ 11
MOUNTING ................................................................................................................................. 11
INSTALLATION OVERVIEW .......................................................................................................... 12
Trigger Function .................................................................................................................... 12
Vertical Plane ......................................................................................................................... 12
Tag Vehicle Installation ......................................................................................................... 12
Parallel Surfaces Rule ............................................................................................................ 12
WIEGAND PANEL WIRING .......................................................................................................... 13
SERIAL PORT RS232 WIRING ..................................................................................................... 13
TROUBLESHOOTING GUIDE ............................................................................................... 13
WIRING GUIDE ........................................................................................................................ 14
LIMITED WARRANTY ............................................................................................................ 15

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Product Description
Scope
This document describes the functional requirements and software features contained in the
newly designed tres900 Enhanced GEN2 Reader hereon known as tres900s. This document
lists the product specifications, as well as performance, and operational criteria.
Summary
The tres900 is the brand name for a new line of 902~928 MHz RFID Readers and Tags. We
are a U.S. based company comprised of seasoned RFID professionals, including engineers,
marketing, and distribution specialists. We have designed a product line that is ideally suited to
the parking, supply chain, document tracking, and many other markets. We will be selling our
products through Systems Integrators, Distribution and OEM channels. The tres900s is
designed and manufactured in the USA to be an enhance version of the present tres900 GEN2
UHF Reader.
The tres900s is designed to reduce the number of electronic components needed for a traditional
Product. This is accomplished by using a custom integrated RF IC in place of many individual
components. The product will offer the following features:
 Wiegand Output Format, multiple and custom formats, 3-wire
 EMI protected I/O lines, i.e. 2 each for Wiegand Output, 1 each for Trigger Input, 2 each for
RS232, 2 each for RS485, etc.
 Reverse Polarity and Over Voltage protection on the input voltage
 Serial RS232 + RS485 Bi-directional, used for configuration and data output
 Buffer (100 mS to 60 sec), read tag + output tag + buffer tag, read and output after buffered time
 Timer read (10 mS to 1 sec), time between read and output data
 Multiple tag reads, single tag process the strongest RSSI read from tags
 LED flashing and Audio (Piezo) tone for power on and for a tag read
 Ethernet TCP/IP Output, daughter board (optional)
 Controller functionality w/relay, Site Code and ID range configurable
 SPI Flash IC to restore the program and store valuable settings
Product Identity
The tres900s will be given an engineering part number. This part number prefix will start with
the prefix number ‘900S’. The firmware version will be ‘900S.0.0.xx’. Designated as:
Model # Board rev Hardware rev Serial Number
900S x xx xxxxx
Reference Documents
 TBD
Revision History
 Rev 01 04/13/19 - first draft by Rick L
 Rev 02 05/31/19 - changes made after evaluating prototype units
 Rev A 06/21/19 - first release after hardware updates and pre-production units

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Product Operations
Hardware Description
The tres900s Reader comes with many rich features like multi-protocol and multi-tag reading,
integrated and environmentally protected packaging and long-distance reading.
The tres900s Reader is a fully integrated reader with a RF module IC, power conditioning,
built-in circular polarized antenna and packaged in a weather-tight and UV protected housing.
The circular polarized antenna allows it to work in AVI and asset management applications and
its programmable triggering modes enable the reader to work in either self-triggering (timing)
or trigger mode. Versatile I/O interfaces enable the tres900s to work with multiple serial
devices and with standard Wiegand controllers.
The tres900s Reader is a multi-protocol UHF reader, which supports ISO18000-6B and EPC
protocols. It can read UCODE, TI, Alien and many other labels. The reader’s firmware is field
upgradable, enabling it to support protocol expansion and feature upgrades, giving it the ability
to grow with the maturing RFID technologies.
The integrated high-gain circular polarized antenna allows the reader to achieve a respectable
read range, and the internal DSP module enables the reader to manage multi-tag arbitration at
high speed, thus making it suitable for AVI and material management applications.
Reader
The RFID Reader is a device that captures and processes tag data. These devices are called
readers or interrogators. Readers are connected to the antenna and are connected to the RFID
network infrastructure. The Reader provides the energy of which a fraction is used to energize
and wake up the tag. The reach of the reader is determined by the design of the antenna (both
Tag and Reader) and the power and configuration of the reader. The Reader detects and filters
data bits emitted from compatible RF Tags then converts the bits into the associated computer
format of serial RS232/485, Ethernet (optional) and/or Wiegand communications protocols.
Advanced error detection algorithms provide error-free operation.
The tres900s Reader operate on a fixed power source of 5vDC. Connection to the Reader is
best made by using shielded twisted pair cables (22 AWG up to 22 feet, over 22 feet see
recommended wire chart at end of this document).
Tags
An RFID-tag is a device which is attached to objects and/or assets to be identified. When radio
signals are received, information is transmitted back to the RFID reader. RFID tags consist of
the following components: the microchip (or IC), the antenna, the connection between IC and
antenna and the substrate on which the tag is produced. The microchips are the brains of the
tag. The antenna handles the communication from either the Tag to the Reader or from the
Reader to the Tag.
Passive tags reflect the RF signal transmitted to them from a reader or transceiver and add
information by modulating the reflected signal. A passive tag does not use a battery to boost
the energy of the reflected signal.

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Wiegand interface
The Wiegand interface uses three wires, one of which is a common ground and two of which
are data transmission wires usually called DATA0 and DATA1, alternately labeled "D0" and
"D1" or "Data Low" and "Data High". When no data is being sent, both DATA0 and DATA1
are pulled up to the "high" voltage level — usually +5 VDC. When a 0 is sent the DATA0 wire
is pulled to a low voltage while the DATA1 wire stays at a high voltage. When a 1 is sent the
DATA1 wire is pulled to a low voltage while DATA0 stays at a high voltage.
The high signaling level of 5 VDC is used to accommodate long cable runs from card readers
to the associated access control panel, typically located in a secure closet. Most card reader
manufacturers publish a maximum cable run of 500 feet. An advantage of the Wiegand
signaling format is that it allows very long cable runs, far longer than other interface standards
of its day allowed.
Serial RS232/RS485
The Reader will output standard RS232/485 outputted via standard ASCII format or HID serial
format and can be viewed on any ASCII terminal viewer like Hyper Term. The RS232 will be
a bi-directional device because it also needs to communicate to a PC the setup parameters
described later in this document.
Trigger Mode
When the Installer puts the reader in trigger mode, the reader will be put into IDLE mode, this
means the reader will not read and power consumption will be only 20mA. Once the trigger is
activated (Trigger wire to ground); it will take 6mS to start reading and outputting tag data
again. There are two external terminals on the connector, software configurable.
Power Requirements
The tres900s is powered from the TRES supplied regulated power supply with a voltage range
of +5vDC @ 2A minimum.
Relay Description
The CPC1018N is a miniature single-pole, normally open (1-Form-A) solid state relay that
employs optically coupled MOSFET technology to provide 1500Vrms of input to output isolation
with up to 600mA Load Current and 60Vp Blocking Voltage. The super-efficient MOSFET
switches and photovoltaic die use IXYS Integrated Circuits Division’s patented OptoMOS
architecture while the optically coupled output is controlled by a highly efficient infrared LED.
Software Description
In this section, we will try to describe options that can be configured in the field. TRES
developed a GUI that will be self-contained (.exe) so it can be run easily in the field and not
have to install it on the user’s device. Below are some of the features that need to be
incorporated in this program.

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Option Feature
These below options should be incorporated into the new setup program that would be used in-
house and in the field by installers to configure the reader for their installation site they are
presently at. Features that should be included are:
 RF Power settings, 10 dBm minimum; to 30 dBm max (pull down menu)
 Wiegand Output, pulse width, and pulse period (see range below in Table and References)
 Read tag output, read buffer to delay tag after first read and output, 100 mS minimum to 60 seconds
maximum, works on both Wiegand and RS232/485 (configurable)
 Timing Read, timing read interval 100 mS minimum to 5 seconds maximum
 Trigger Read Delay, length reader powered after Trigger let go, 0 to 100 seconds
 Single tag read mode (strongest tag RSSI read) or multiple tags; selectable
 Switch between Wiegand + Serial or Serial Only modes
 Serial output configured for Raw ASCII or HID serial simulation
 RS485 configurability, Baud rate, Protocol (CR/LF or OSDP), and Address
 Incoming Tag ID, output certain Facility Code 1 to 255 (26-bit only range), tag IDs’
 Relay: not Enabled, Hold Time 100 mS to 3 seconds
 Indicators control, LED + Audio, On /Off, software configurable
 Log window, to monitor tags being read
 Update Firmware, a feature to field flash the firmware
 Large Tag display window to read tag data at a long distance
Default tres900s settings
 Radio Power: 30 dBm
 Reader: Timed Mode, Multiple Tags, 500mS timed interval, and trigger read delay 0 sec.
 Serial Comm: RS232 baud rate 115200, ASCII mode
 Wiegand: Wiegand + serial, output buffer 500mS, Pulse Width 80uS, Pulse Period 1200uS
 Ids: Facility Code is not selected
 Relay should not be selected
 Output Wiegand + Serial
 Output Buffer set to 0.1 sec
 Received Timing selected
 LED selected
Connecting to tres900s
In this section we will detail the incoming wires to the tres900s reader. Please refer to the label
and diagram that follows this text and note the terminal markings.
Wiring Diagram
The top label designates the signal to the main PCBA, described later in this document, and the
bottom color labels denote the color cable codes used on the present tres900 Reader.

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LED Control
This is an LED control output; it will power an LED with 3.3v DC. The LED+ goes to the
Anode of the LED while the LED- goes to the Cathode of the LED.
RS232 Control
This input / output lines are used to control or be controlled by and RS232 device. Line
description, 232T goes to pin 3 of a 9-pin DIN (RX), 232R goes to pin 2 of a 9-pin DIN (TX)
and 232- goes to pin 5 of a 9-pin DIN (ground).
RS485 Control
This input / output lines are used to control or be controlled by and RS485 device. Line
description, 485B normally goes to the T/R- or 485B line, 485A normally goes to the T/R+ or
485A line and the 485- is the Ground line.
Earth
Here you would connect an Earth ground to the reader instead of or still to the back panel of
the reader.
Power Connect
This is where you get power to the reader from TRES supplied regulated power supply.
Remember to use the TRES regulated DC supply +5vDC @ 2A. The reader has a built-in linear
regulator with EMI, reverse polarity and overvoltage protection.

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Relay Control
You can use this relay to control a power relay or an external LED that needs more power than
supplied. You could put 12vDC on one side of the relay and an LED to ground on the other.
The relay is a form C NO relay.
Trigger Control
Here is where you would connect your relay output from a detection device or anything you
would want to control the reader. When you select trigger mode, you need to short-out the
RLY+ line with the RLY- line, usually thru a dry contact.
Wiegand Control
This is your typical open collector Wiegand output terminals. The WIG1 line goes to your
DATA 1 (D1) terminal on your controller, the WIG0 line goes to your DATA 0 (D0) terminal
and the WIG- is the Wiegand ground line.
tres900s Interface Setup Program
In this portion of the document you will learn how to communicate and configure the tres900s
Reader. Hook up your tres900s and stated in the previous section, connect to a serial port, and
power up everything. When you run the TRES_SETUP.EXE program (Downloadable from our
website) you will see the following screenshot:
As you can see from the image above, you have many features that allow you to modify the
tres900s reader, so you can have a more successful install. These features were described above
in this document and below.

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Upper Left Tools
In the upper left section of the tres900s Setup
utility you will see three (3) icon buttons, the one
that looks like a gear (next to check mark) has the
following four (4) options:
1. Open Tag Display, this is a feature that will
display a large window in the upper portion
of the computer screen that will display any
valid 26-bit Wiegand that is read by the
iModule. This is a usefull tool to easily read
the decyphered Wiegand tags.
2. Reader IP Address List, allows you to
modify the IP settings if you have the TCP/IP
option.
3. Set IP Address, after you modified the IP
address, this will upload it to the reader.
4. Update Firmware, this allows you to update the firmware in the field. This is useful if
there are changes to the product or if you have custom firmware.
5. Reader ID, this is where you can get the serial number on the reader, can only be modified
at the factory.
Control Section
This is the first section you will use to connect to the tres900s, here is where you will connect
and communicate between your computer and to the tres900s. You may first want to do a Device
Manager lookup on your computer to see what COM PORT you are using to connect to the
reader with.
Comm
Upon power up, the tres900s will search for available communication
devices. Select the appropriate Comm Port device from the drop-down menu
to connect to your computer to the reader, then press the Connect button, if
you have the TCP/IP option, you can also select it here. When connected, you
will get the screen that states that you are connected, a Query is done during
the connection process. When finished using the setup program, just press the
Disconnect button. If you plug in your serial device after starting this
software, that device will not be recognized, you will have to shut down the
setup program, then restart the setup program in order to recognize your
communications port.
Reader Interface Actions
Query Reader, this should always be done if you made changes to the reader
and wanted to get the stored data from the tres900s. A Query is done
automatically when you first connect to the tres900s and run the setup program.

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Set Parameters, this is the icon button you press to update the Reader settings with your changes
you make. After you make your changes to the reader, you will have to press this icon button in
order to send your changes to the flash memory.
Set Defaults, in case you get lost and want to reset all setting to factory default, you would press
this icon button to restore all your setting to the factory default mode.
Restart Reader, this just restarts the reader instead of having to remove power.
RF Section
This is where you would change the RF output power from 10dBm to 30
dBm. The higher the number, the more power the unit puts out. Remember,
if you push too much power out, it will act just like a stereo where when
you crank it too loud, the signal gets distorted.
Reader section
This section allows you to modify how you read a tag. The explanation will
follow along with describing each section.
Mode, this is where you would select Timing or Trigger mode. Timing
mode is where you are constantly reading tags. Trigger mode is where the
reader is not reading tags until the trigger line is triggered (shorted to
ground).
Use RSSI, this allows you to power a tag at maximum distance and only read if at a distance set.
This function is not fully working yet.
Timed Interval, this is where you set the frequency of when you read tags, minimum is 100mS
and maximum read interval is 5 seconds.
Trigger Read Delay, this is the setting to leave the reader on after the trigger is released,
minimum setting is 0 seconds and maximum is 10 seconds.
Serial Comm Section
Mode, this portion allows you to select between standard ASCII (2 HEX
character F/C and 4 characters ID) or HID Serial PROX reader output from
a converted Wiegand Input. An example of the HID
format is the top line to the right and the ASCII
equivalent is the second line, where the first two HEX characters is the
Facility Code (0F hex = 15 decimal) and the second four charcaters is the
ID number (0005 hex = 05 decimal).
RS232, here you will select your baud rate you want to communicate thru
the serial port. Selections are 9600, 19200, 57600, 115200 (default). This is usually set to the
115200 baud and most devices are automatic baud selection, this is mainly for use with your
dumb terminal program like HyperTerm or CoolTerm.
RS485, in this section you can also modify the baud rate of the RS485, just as you did with the
RS232, 9600, 19200, 57600, 115200. The Protocol option allows you to select either the standard
CR/LF output, or the secure OSDP option.

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Wiegand Section
This is where you can modify your Wiegand settings. You normally would
not need to modify the Wiegand settings, but if you are running longer cable,
then you may have to. To modify the Wiegand timing, go to the Wiegand
Setting section of the Setup Software, then select the desired timing
parameters.
Output Mode, you have the options of select to output both Wiegand and Serial or just the serial
data.
Output Buffer, this allows you to select a Wiegand buffer from 100 mS…60 seconds. That
means, when the tres900s reads the first tag, this tag will be outputted thru either or both
Wiegand and serial, then store this tag into the buffer for time selected or until another valid tag
is read. If another tag is read before the timer times out, this tag data will be outputted, the buffer
will be reset, and this tag will be the new stored tag.
Pulse Width, this allows you to modify the Wiegand Pulse Width, the specification is 20 µSec
to 100 µSec
Pulse Period, this allows you to modify the Wiegand Pulse Period, the specification is 200 µSec
to 20000 µSec
IDs Section
In this section of the software, you will have the ability to select then add a
Facility Code and/or ID number(s). This is where you select and set a facility
code and all other facility codes read will be ignored. If no facility code is
selected, all valid IDs will be outputted per user configuration. If one Facility Code is selected,
only this Facility Code will be outputted per user configuration.
Use Facility Code, when this box is selected, a facility code will be used to output only the
facility code selected. This means that you can read other tags with a different facility code and
they will not be outputted to your device. If you select the relay option, later in this document,
then only when this facility code is read, the relay will engage.
Facility Code, here you will select the facility code
you want to output only. When you select between
0...255, only a tag read with this site code will be
outputted thru the Wiegand port. You can use the up
down scroll option or you can just enter the facility
code you want. Remember to send your changes to
the reader by using the ‘Send to reader’ option.
Tag IDs, this is where you add, modify and delete ID
numbers. See larger picture on the right. First you
select the Add button on the right of the popup box
and another popup box will be displayed.
You can enter a single number or a range of numbers. The single number can be entered by just
entering a number in the highlighted box

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You can also select the Enter range of data box and enter
the starting ID then the ending ID. You have up to 100
different IDs. Once completed, just press the OK to save or
Cancel to not save them. You now need to press the Send
to Reader button to update your changes into the readers
flash memory.
You can send this data to the Reader, Fetch numbers already
stored in the Reader or you can Clear and start over. Remember to always send your changes to
the memory by using the ‘Set parameters’ option mentioned earlier after you ‘Close’ from this
option. This is just a precaution; I also will query the memory to see if my changes were saved
properly.
Relay
Enabled, when this box is selected, you enable the use of the relay.
It works off the Facility Code, if no Facility Code selected, then it
closes contact on any valid Wiegand input read. If the Facility Code
and/or ID range selected, the relay will close only when a valid tag
with that Facility Code and ID range is received from the reader.
Hold Time, this is the relay hold time, you select between 100 mS…3 seconds. When the relay
is selected, and a valid tag is read, this time selection will keep the relay closed for that period
of time. This is handy when you want to control a device for a longer or shorter period of time
after the valid tag is read and manipulated per user configuration.
Indicators
Here is the section where you turn the LED and the Audible Beeper ON/OFF
for a valid read. The factory default is on but if you do not need to see an
LED flashing or hear the Beeper beeping for a valid Wiegand read, then you
can turn either of them off here.
Log Window
This is a very useful section, every valid tag read will be
converted and displayed here. Even if you set facility code, every
valid tag read will be displayed. This is a very useful tool for
troubleshooting your tag data and a good way to check the tags
programming.
Pause, this icon button just stops displaying the inputted tag data.
Like anything else, if you tired of seeing data displayed, then you
pause the data being displayed.
Clear, this icon button is useful for clearing out the log window.
Sometimes you get too much data and want to clear it out and start
over.

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Specifications
Item Details tres900s
Operating Frequency 902.75MHz～927.25MHz @ 500KHz hop (50 total hops)
RF Protocol ISO18000-6B, EPC Class 1, EPC Class 1 GEN 2
Operating Method Frequency Hopping Spread Spectrum (FHSS)
Antenna Internal 7dBi circular polarized
Max RF Power 30 dBm (1 Watt)
RF Power Range 10~30 dBm, Software Adjustable
Tag ID Modes Timed Mode - automatically reads at fixed time
Trigger Mode - external trigger control to read
Wiegand Timing Parameters Pulse Width 80µS, Pulse Period 1200µS (adjustable)
Identify Tag Time <8ms - Identify single tag
Reading Tag Time Reads every 8 bytes in less than 5ms
Reading Tag Distance 18’ to 25’, depends on variables defined later
Communication Interface RS-232, RS-485. TCP/IP, OSDP, Multiple Wiegand Formats
Input One-way trigger input
Power Supply (suggested) 5VDC @ 2Amp (supplied)
Power Consumption (peak) 1.5 A max. @ 5VDC (7.5 Watts)
Size 10.075" diameter (273.05mm) x 3.85” thick (97.79mm)
Work / Storage Temperature -4°F to 158°F (-20°C to +70°C) / -40°F to 185°F (-40°C to +85°C)
Certifications FCC Part 15 Subpart C and Canada RSS-210
Working Status Indication Audible Beeper, external LED option
Extra Features/Options Relay, External LED, Multiple Wiegand Formats, OSDP, scrambled tag
data to reader, TCP/IP, RS485
Reader Installation Guide
This section contains information for configuring the Reader’s power and signal cabling. Power
and communications are provided through supplied two phoenix plugs (one 8-pin and one 10-
pin) that you can remove from the PCBA, attach your wires, then reinsert the plugs to the
connectors.
Mounting
The mounting bracket is designed specifically for mounting the tres900s Reader. The Reader
could be installed on a pole or on wood, concrete, or brick structures and aim the antenna toward
zone of coverage. Figure 7 below shows how the bracket looks assembled on a pole. The tool
of choice would be a 3/8” (10 cm) wrench.

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Figure 7
Installation Overview
The Reader is supplied in a weatherproof enclosure for direct outdoor installation or can be
placed indoors, such as in a guardhouse, or close to other electronic equipment. The Reader
outputs the decoded ASCII data to an access control unit via standard data cabling. The system
outputs data in both the standard Wiegand and serial RS232 outputted simultaneously.
Trigger Function
If the Reader is configured for triggering mode, the reader will only read a tag when the BLUE
trigger wire (T1) is tied to ground. Normal ways to accomplish this is by using Loop Detectors
to detect the presence of a vehicle to open a gate, or as a safety device to prevent the gate from
closing on a vehicle in its path.
Vertical Plane
Vertical orientation is adjusted so as to aim the antenna at a spot about twenty feet (6.5 M) on
the road from the vehicle. From this spot forward, the detection area will increase as you get
closer to the gate.
Tag Vehicle Installation
A vertical orientation is the optimal orientation of the Tag in order of signal response
performance. If not a windshield tag, then install the Tag using double-sided tape or Velcro™.
Ensure the label-end of the Transponder is mounted in a vertical position for optimum read
range. Prior to installation, make certain the desired location complies with all state and local
vehicle code laws.
Parallel Surfaces Rule
Passive RF tag actually gets its power from the reader. That is to say that, the reader is emitting
RF and the tag must be able to absorb that RF, accelerate the signal and to reflect it back to the
reader. Therefore, if the surface of the reader and tag are close to parallel, this principal will
result in better tag reads.

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Wiegand Panel Wiring
Serial Port RS232 Wiring
Troubleshooting Guide
Q: To confirm that the unit is operating properly
 Confirm the beeper is audible when a good tag is presented or when power is first applied. If it is
not, remove power.
 Check that the RED and BLACK wires are installed correctly
 Check the voltage at the Reader pigtail cable (see wire chart below), if you under cabled the
voltage drop would be too much to power up the Reader. Verify the voltage supplied to the
Reader is 5 VDC
Q: Reader just beeps and keeps beeping, about 3 x per second
 Not enough power from the power supplier, Insufficient power,
 Check the voltage at the Reader pigtail cable (see wire chart below), if you under cabled the
voltage drop would be too much to power up the Reader. Verify the voltage supplied to the
Reader is 5 VDC
Q: Reader does not recognize a tag (no beep, no outputted tag data)
 If no beep, check to see if another tag works, maybe damaged tag. Verify Reader operations by
connecting to a computer through the RS232 port and running a Terminal program.
Q: How can I verify that the tres900 Reader I have is Wiegand or serial or TCP/IP?
 Both Reader products have RS232 and one model has Wiegand and one has TCP/IP. The TCP/IP
model has a cat 5 cable with an 8-pin connector attached.
Q: Tag data to panel is scrambled or Reader beeping and host not responding
 One or more of the Reader’s wiring connections are incorrect. Power down the receiver/panel and
verify the wiring connections are correct. Check that Data 0 (GREEN wire), Data 1 (YELLOW
wire) and ground (GRAY) are properly attached between the tres900 to the host panel.
 Earth Ground should terminate at the back of the Reader through the mounting brackets or
through the Readers Power Supply Ground wire (negative feed).
 Cable between Reader and panel is too long, check Wiegand specifications
 Check to insure the tres900 tag number and site code are properly programmed in the host panel.
 Check the Wiegand timing that your host is looking for and ensure their timing scheme is within
the SIA standard parameters.
Q: Read Range too short
 Ground loop could be an issue here, see if earth ground terminates at the reader. Check by
powering reader without reader ground wire connected. Earth ground should terminate at the
Reader, check your panel or power supply.
 Tag orientation should be in a vertical position for the Readers Antenna maximum performance
and distance.

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Wiring Guide
Selecting the correct size and type of wire will enhance the performance and reliability of your
system. The size of the wire must be large enough to carry the maximum current expected
without undue voltage losses. All wire has a certain amount of resistance to the flow of current.
This resistance causes a drop in the voltage from the source to the load. Voltage drops cause
inefficiencies. The wire sizing guide below provides the minimum wire size needed to limit
voltage drops to 10% at a given distance in a 5vDC system.
POWER WIRE GUAGE
W(VA)/Amps 12 AWG 14 AWG 16 AWG 18 AWG 20 AWG 22 AWG 24 AWG 26 AWG
20W/1.67A 147’ 95’ 62’ 39’ 25’ 15’ 10’ 6’

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LIMITED WARRANTY
Transponder and Reader Engineered Systems, Inc. (hereafter TRES) warranties its tres900s tag
readers, cards and tags to the original purchasers to be free from defects in material and
workmanship for a period of one (1) year from the date of shipment, subject to exclusions below.
The Reader warranty is contingent upon the use of the TRES provided power supply.
Return Material Authorization: TRES liability under this warranty is limited to the repair or
replacement of the defective product (at the discretion of TRES). Product will be returned to TRES
only after the issuance of a Return Merchandise Authorization (RMA) by TRES Technical Support
Dept. TRES will provide advance replacement of tres900s readers submitted for warranty claim
provided that the customer requests advance replacement with the issuance of a Purchase Order at
the time an RMA is issued, at which time an invoice will be generated for the Advance
Replacement product(s). If the product to be returned under RMA is not received by TRES within
30 days of RMA issuance, or the warranty is determined to be void under the conditions of this
warranty statement, the customer will be responsible for payment of the invoice issued at the time
of the Advance Replacement, subject to normal credit terms and conditions. Customer will be
responsible for shipping the RMA products to TRES at address listed on the RMA form and clearly
marking the outside of the box with the RMA number. If the reader(s) are covered under this
warranty, then a credit will be issued against the Advanced Replacement invoice.
Repairs: TRES liability under this warranty is limited to the repair or replacement of the defective
product (at the discretion of TRES). If the returned product is tested and deemed to be fully
functional, it will be returned to the customer and a $ 50.00 evaluation fee will be assessed. If the
returned product can be repaired, and the product is deemed to be covered by warranty per this
warranty statement, it will be repaired free of charge. If the returned product is not covered under
this warranty, then it will be repaired at a cost of $ 75.00 per hour labor plus cost of parts. In the
event of a required repair that is not covered by warranty, the customer will be contacted prior to
the start of repairs and provided an estimate of said repairs.
Warranty Exclusions:
a. Defects or damage resulting from use of the product in manners other than normal and
customary.
b. Defects or damage from misuse, accident, vandalism, neglect or attempted modification.
c. Defects from improper installation, testing, operation, maintenance
d. Damage due to improper wiring of devices not in accordance with published installation
instructions.
e. Attempted disassembly or repair without written authorization from TRES.
f. Power surges due to malfunctioning power supply regulation, surge suppression or lightning.
g. No returns/refunds on custom tags
h. Tags that have been de-faced, mishandled, improperly mounted and/or removed and re-
mounted
This warranty is extended by TRES to the original purchaser and may not be assigned or
transferred to any other party. This is the complete and exclusive warranty for tres900s
readers and tags sold by TRES, and this warranty may not be enlarged by any other
statements that are not a part of this warranty statement without TRES’ express written
consent.