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IntelliTouch/SecureTouch 2701RSU Dual Serial/USB ControllerThe 2701RSU controller is part # D68054-000. This controller replaces the 2500Uz USB Controller and 2500Sz Serial controller.
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| 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.
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:
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.

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

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 |
| J2-1 | BOOT_N |
| 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.
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.