Elo Touch Solutions

IntelliTouch/SecureTouch 2701RSU Dual Serial/USB Controller

The 2701RSU controller is part # D68054-000. This controller replaces the 2500Uz USB Controller and 2500Sz Serial controller.

2701RSU Dual Serial/USB ControllerSupply Voltage and Current

  • +5 VDC, nominal (+4.75 to +5.25 VDC)
  • Operating current 75mA, maximum at +5 VDC. Typical power dissipation is 300mW at 5V.
  • Inrush current of up to 600mA for 50mS following power on
  • Supply must be capable of sourcing 200 mA, minimum.
  • Total noise and ripple requirement must be less than 100 mV (p-p) for frequencies below 1 MHz, and less than 50 mV (p-p) for frequencies above 1 MHz.

Serial Interface

  • EIA 232E (Serial RS-232), DCE configuration. 8 Data Bits, 1 Stop Bit, No Parity, Full Duplex
  • Hardware handshaking: RTS/CTS
  • DSR is pulled HIGH (>+3V) by the 2701RSU when connected and powered. DTR can be asserted by the host to interrupt the flow of data from the controller.
  • Note that if the application does not monitor CTS, then an interval of approximately 5 seconds should be inserted between the issuance of a reset command and any other command.

Baud Rate

  • 9600 (default) and 19200

USB Interface

  • The CTR-270100-IT-RSU-00R controller is an interrupt-type, full-speed USB device.

Operating Modes

  • Full IntelliTouch SmartSet protocol
  • Customer specific protocol
  • Initial/ Stream/ Untouch Modes

Touch Resolution

  • 4096x4096, size independent

Conversion Time

  • Approximately 10 ms per coordinate set


  • MTBF greater than 1,543,000 hours per MIL-HDBK-217-F2 using the parts stress calculation method for ground benign environment with an ambient temperature of 25°C


  • Operating: 0°C to 65°C
  • Storage: -25°C to 85°C


  • Operating: 10% to 90% RH, noncondensing
  • Storage: 10% to 90% RH, noncondensing

Operating Altitude

  • 10,000 feet

Shock and Vibration

  • The controllers, when packaged in Elo standard controller shipping container, shall meet the requirements of the International Safe Transit Association project 2A test procedure.

ESD: Controller Alone

  • Per EN 6100-4-2 1995. Level 4
  • Contact Discharge - 8kV
  • Air Discharge - 15kV positive and negative polarity

These ESD impulses are applied directly to the pins on P2.

The Serial port is tested to simulate ESD impulses applied to the monitor connectors. This is done by applying the ESD impulses to P1 via a 560 ohm resistor and a 10" wire. The pins to be tested in this way are shown in Table 1.

Table 1. P1 Pins for ESD Testing

P1 Pin Signal Name Signal Function P1 Pin Signal Name Signal Function
      2 GND Ground
11 DCD Serial Port 12 DSR Serial Port
13 RxD Serial Port 14 RTS Serial Port
15 TxD Serial Port 16 CTS Serial Port
17 DTR Serial Port 18    

The USB pins, pins 1, 3 and 4 are tested using an ESD generator equipped with a standard finger probe and set to 15kV. The ESD generator is applied to the series A receptacle at the host end of a 1m USB cable, which is plugged into the controller USB series B receptacle. The controller is powered up and grounded.

The controller may not function correctly after applying the discharge, however, it should function without deterioration after reset or recycle of the supply. The ESD tests will be conducted with the controller integrated into a monitor with the controller and the ESD generator grounded to the monitor chassis.

ESD: Controller and Screen

When ESD impulses are applied to an Elo IntelliTouch screen connected to the 2701RSU controller, the screen and controller combination is tested to the standards shown below:

  • Nevada State Reg No. 14, electrostatic discharge (ESD) Part 5.1.1 and 5.1.2. (no disturbance to 20 kV and self-recover from disturbance up to 28 kV). Tested with positive and negative polarity.
  • Montana Department of Justice, Gambling Control Division, New Gambling Device and Modification Submissions, Static Test requirement for AC 40 kV/500 MHz


  • The printed circuit board substrate is rated 94V0. All plastic components, such as headers and connectors, are also rated 94V0.


  • Four-layer surface-mount design with internal ground plane for EMI suppression.


  • Total width: 2.1 inches (53.3 mm), including connectors
  • Total length: 3.30 inches (83.82 mm)
  • Total height: 0.40 inches (10.16 mm)
  • All mounting holes are plated through for chassis ground connection. Refer to the drawings at the end of this document.

The power/interface connector, P1, is a MOLEX 53505-2090, 1.25mm pitch 20 pin, top contact style connector, intended to be used with single wired pins in a 20 pin header. The pins are numbered as shown in Table 2.

Matching header is MOLEX 51127 housing, with MOLEX 50516 terminals. For more information please see the Molex website.

The power/interface connector location is shown in the drawing at the end of this document.

Table 2. Power/Interface Connector P1 Pin Numbers and Signal Names

P1 Pin Signal Name Signal Function P1 Pin Signal Name Signal Function
1 VBus USB Power 2 GND Ground
3 D- USB D- 4 D+ USB D+
5 Vcc +5V Power 6 GND Ground
7 - Reserved 8 - Reserved
9 LEDN LED Out 10 RSTN Reset Input
11 DCD Serial Port 12 DSR Serial Port
13 RxD Serial Port 14 RTS Serial Port
15 TxD Serial Port 16 CTS Serial Port
17 DTR Serial Port 18 - Reserved
19 GND  Ground 20 no connect no connect

Table 3. USB Interface on Connector P1, Pins and Signal Names

Signal Name USB (series A and B) pin P1 pin Signal Function
Vbus 1 1 USB Power
D- 2 3 USB D-
D+ 3 4 USB D+
GND 4 2 Ground

Table 4. Serial Connections to Standard DB9 Wiring Chart

Signal Name DB-9 pin  P1 pin Sourced by  Signal Function
DCD 1 11 ctlr "carrier detect", handshake = '0' (POSITIVE) when controller power on
DSR 6 12 ctlr "data set ready", handshake = '0' (POSITIVE) when controller power on
RxD 2 13 ctlr serial data from controller to host
RTS 7 14 host "request to send", handshake = '0' (POSITIVE) when controller may send
TxD 3 15 host serial data from host to controller
CTS 8 16 ctlr used as "ready to receive", handshake = '0' (POSITIVE) when host may send
DTR 4 17 host "data terminal ready", handshake = '0' (POSITIVE) when controller may send
RI 9 - n/u not used
SG 5 19 com signal ground

The controller supports hardware handshaking. If the handshaking signals are not connected, the controller defaults to a transmit enabled mode. If the handshaking signals are connected, then the controller will stop transmitting when either DTR or RTS is asserted (driven to logic "1") by the host. When the controller's receive buffer is full, it asserts (drives to logic "1") the CTS signal to halt the host.

Signal electrical characteristics are given in the following table. These specifications are extracted from references 2 and 3, and they comply to ANSI/EIA/TIA 232-F.

Table 5. Serial Signal and LED Electrical Characteristics

Parameter Value Signals EIA-232 Subsec.
Minimum ON state input volts 1 +3 volts TxD, RTS, DTR 2.1.3
Minimum OFF state input volts 1 -3 volts TxD, RTS, DTR 2.1.3
DC Load Resistance 5 kΩ ± 2 kΩ TxD, DTR, RTS 2.1.4
Source Impedance (Power Off) > 300 Ω DSR, DCD, TS, RxD 2.1.5
Power-off condition interpretation ON condition RTS, DTR 2.1.5 
Output Voltage, Open Circuit 25 volts, max. 2 RxD, DSR, DCD, CTS 2.1.6
Output Voltage into test load 3 >5, <15 volts 2 RxD, CTS, DSR, DCD 2.1.6
Short Circuit Current <100 mA RxD, DSR, DCD, CTS 2.1.6
Transition Characteristics per EIA-232-E 4 RxD, DSR, DCD, CTS 2.1.7
External LED short circuit current 5 0.5mA nominal LED N/A

1 Measured with respect to circuit AB, Signal Ground.
2 Absolute magnitude.
3 Output voltage measured over the entire range of test load from 3000 ohms to 7000 ohms.
4 The transition characteristics comply with ANSI EIA/TIA-232-E while the controller is powered on; during power up and power down some of the criteria will not be met.
5 LED cathode drive is through 1kOhm to ground. Connect the anode to controller +5V supply.

The touchscreen connector, P2, is a dual row by six position header with 0.025 inch square pins spaced on 0.100 centers. P3 mates with the Berg Mini-Latch receptacle on the IntelliTouch touchscreen cable. The withdrawal force exceeds 3.9 lb.

Pin diagram for touchscreen connector, P2, as viewed from connector mating surfaces

Figure 1. Pin Diagram for Touchscreen Connector, P2, as Viewed from Connector Mating Surfaces

Pin diagram for touchscreen connector, P3, as viewed from above board

Figure 2. Pin Diagram for Touchscreen Connector, P3, as Viewed from above Board

The LIF connector is AVX 6254-010-000-800 and accepts flat cable with conductors on 0.5mm centers. Nominal cable thickness is 0.3mm.

More details can be found at http://www.avx.com

Table 6. Touchscreen Connectors, P2, P3, Pins and Signal Names

Signal name  P2 pin  P3 pin  Signal function
Chassis 1 no connect frame ground for cable shield
none 2 no connect connector key
Y rcv + 3 4  
Y xmt + 4 2  
Y rcv - 5 5  
Y xmt - 6 1, 3  
analog gnd 7 no connect analog ground
X xmt - 8 8, 10  
X rcv - 9 6  
X xmt + 10 9  
X rcv + 11 7  
none 12 no connect connector key

The JTAG connector, P4, is reserved for Elo use.

The jumpers on the CTR-270100-IT-RSU-00R controller are enabled by placing shorting jumpers on specific jumper headers as shown below or disabled by leaving the locations open.

Table 7. Jumper Locations and Function If Installed

Jumper Function
J1 Short 1-2, self powered. Short 2-3, not permitted
J2-2 Initialize NVRAM 1

1 The serial number is not modified.

The CTR-270100-IT-RSU-00R controller has two LED status indicators.

D2 is the status LED, and will blink slowly, about once per second, when the controller is working properly. A fast blink, about 4 times per second, means an error has been detected.

When the USB power is connected, the LED will be constantly on until USB enumeration is complete. An irregular blinking during startup is normal, and shows the controller is autosizing the screen.

D1 is the touch detection indicator and will be constantly on during touch.

  • Elo controllers are "CNR/USR" UL Recognized Components for USA and Canada, Category NWGQ2, Information Technology Equipment Including Business Equipment.
  • Elo controllers are TUV Bauart certified as components.
  • Elo controllers have been tested for compliance with FCC Part 15 Class B limits.
  • Depending on the application, it may be necessary to pay special attention to system grounding and shielding, and it may be necessary to apply ferrite suppressor beads.
  • Look up product statement of compliance by part number

The CTR-270100-IT-RSU-00R controller can be programmed to respond to customer specific commands, using the 'E' (emulate) command. Contact Elo for details.

  • Serial cable: P/N D16890-000
  • USB cable: P/N D38640-000
  • Dual serial/USB cable: P/N D40022-000