Elo TouchSystems IntelliTouch E281-2310 Produkthandbuch
SmartSet Technical Reference Manual—Addendum for the E281-2310 Controller 1
DOC # SW000027-B (Preliminary) August 13, 1998
E281-2310 Serial Controller
The following figure shows the mounting dimensions, jumper locations, and
connections for the IntelliTouch®E281-2310 serial controller:
Figure 1. E281-2310 Serial Controller
The following table lists the jumper settings for the E281-2310 controller:
(From Top)
Reserved J0 - N
Reserved J1 - N
Emulation Mode
None J2 - N
E281A-4002 J2 - Y
Reserved J3 - N
E281-2310 Emulation Modes
If you are using driver software that does not directly support the SmartSet™
serial protocol (E281-23xx, E271-22xx), the controller can be set up through
jumper J2 for hardware compatibility with the IntelliTouch E281A-4002
controller.
SmartSet Technical Reference Manual—Addendum for the E281-2310 Controller 2
Serial Controller Installation
This section assumes you are integrating the E281-2310 serial controller board
into your system as a component.
The following information gives you mounting dimensions, touchscreen
connections, power connections and requirements, and data output connections. It
is your responsibility to determine how best to mount the controller and data
connector in the display or separate enclosure, and provide a power supply.
Mounting the Controller and Connecting Chassis Ground
The mounting dimensions for the E281-2310 controller are shown in Figure 1,
page 1. Remember that the cable headers will increase the space required.
The mounting holes fit common 0.156 inch plastic snap-in standoffs. A chassis
ground connection is required through one of the plated through mounting holes
(PTH) or P4 pin 8 to provide adequate shielding for the touchscreen cable.
Conductive mounting hardware can provide a chassis ground connection for the
controller.
Serial Controller Connections
Power Connections
The E281-2310 controller operates on a single voltage, positive with respect to
ground. See page 10 for power requirements.
Connect a power cable harness to P4 on the controller, a 2x5 header with pins on
0.100" centers. Use a ribbon cable with an IDC connector or crimp-to-wire pin
receptacles. An acceptable plug can be selected from Molex series 70450, Amp
AMPMODU Mod. IV product line, or Berg mini-latch housing with Mini-PV pins.
Connect a power supply to the harness and then to AC.
9 7 5 3 1
· · · · ·
· · X · ·
10 8 6 4 2
Figure 2. P4 Power Supply Connector Pin Positions, End View
SmartSet Technical Reference Manual—Addendum for the E281-2310 Controller 3
P4 Pins Signal Function
1+Pwr Supply voltage positive
2PwrCom Supply voltage negative (tied to pin 4)
3N/C
4PwrCom Supply voltage negative (tied to pin 2)
5LED Remote External LED driver
6Key
7N/C
8Chassis Frame ground connection
9-Reset Open collector input: open = normal
operation; short to PwrCom = hardware
reset.
10 N/C
Serial Connections
The E281-2310 controller operates at standard RS232C levels. The serial port
connector, P2, is a 2x5 header with pins on 0.100" centers. It is configured so a
ribbon cable and commonly available insulation displacement connectors (IDCs)
may be used.
9 7 5 3 1
· · · · ·
X · · · ·
10 8 6 4 2
Figure 3. P2 Serial Connector Pin Positions, End View
CAUTION
Observe polarity when connecting the power leads to the power supply. Reversing
polarity may damage the controller.
SmartSet Technical Reference Manual—Addendum for the E281-2310 Controller 4
P2 Pins DB25 DB9 Host Signal
181DCD (N/C)
266DSR
332RXD
447RTS
523TXD
658CTS
7 20 4 DTR
8 22 9 RI (N/C)
975GND
10 Key
The controller only requires a 2-wire connection, controller Transmit Data (P2
pin 3) and Signal Ground (P2 pin 9). For two-way communications, the controller
Receive Data (P2 pin 5) should also be connected to the host Transmit Data pin.
Data Set Ready (DSR) and Clear to Send (CTS) may be used by the host to verify
controller connections and operation. DSR is asserted when power is applied to
the controller and CTS is asserted when the controller's power-on sequence is
complete. Data Terminal Ready (DTR) and Request to Send (RTS) can also be
connected for full hardware handshaking.
Elo driver software typically requires two-way communication (unless ELODEV’s
-p- flag is used), and all four handshaking lines.
If you are installing the controller inside a display, we recommend that you make a
cable that connects P2 to a DB9 female connector mounted on the back of the
display, or use Elo's serial cable P/N 012138. (Male connectors are used on
TouchMonitors with external controllers.) The shell of this connector should be
tied to chassis ground. Use an additional cable from the back of the display to your
serial port.
Elo can provide suitable adapters and cabling. See the IntelliTouch Product
Manual for details.
Touchscreen Connections
A round multi-conductor cable terminated in a 2x6 female connector is attached to
the IntelliTouch touchscreen. One of the following cabling options normally
applies:
•If the controller will be located inside the display, the touchscreen cable
connects directly to the 2x6 header at P3 on the controller (see Figure 1,
page 1).
SmartSet Technical Reference Manual—Addendum for the E281-2310 Controller 5
•If the controller will be external to the display, the touchscreen cable should be
terminated at the back of the display with a DB9 male connector. Use Elo's
IC1 adapter cable (P/N 012226). Then connect a cable from the DB9 male
connector to the controller using Elo's cable P/N 002863-6-2 with the Elo
002861-2-12 adapter. Unlike the serial cable, the touchscreen cables have a
special construction. Use only Elo Touchscreen cables and adapters.
2 4 6 8 10 12
X · · · · X
· · · · · ·
1 3 5 7 9 11
Figure 4. P3 Touchscreen Connector Pin Positions, End View
Diagnostic LEDs
The E281-2310 controller has one green diagnostic LED. Following power on, the
controller performs a short self-test, where the LED stays lit. After the self-test,
the LED flashes once per second, indicating normal operation. The self-test results
are displayed by most Elo driver software.
During normal operation, the LED also indicates controller/host communication is
in progress. When the touchscreen is touched, the LED should light continuously,
then return to the normal flash rate. If the host does not remove the packet from
the controller, the LED will stay lit.
The LED will also stay lit without a touch if the touchscreen or cabling is
disconnected or not functioning.
If the LED flashes about two times per second, a warning error condition is
indicated, such as improper communication from the host. Suspect an invalid
command sequence from the host.
Remote LED Capability
The microprocessor pin that drives the status LED is connected to pin 5 of the P4
power supply connector. This signal from the microprocessor may also be used to
drive an external indicator such as another LED.
To operate an external LED, connect the LED anode to a +5 Vdc power supply
and the cathode to pin 5 of the P4 connector. (Nominal current through the LED
will be 3 mA—the LED will be comparatively dim.)
SmartSet Technical Reference Manual—Addendum for the E281-2310 Controller 6
COMMAND REFERENCE
The following changes/additions are to Command Descriptions found in the
SmartSet Touchscreen Controller Family Technical Reference Manual:
page 82 '0' 30h No Warning
'9' 39h Reserved
'H' 48h Reserved
'I' 49h Reserved
'J' 4ah Reserved
'L' 4ch Operation failed
'M' 4dh Measurement warning
'N' 4eh Measurement error
page 83 Untouch factory default value is 2 for the E281-2310 controller.
page 84 Not supported.
page 87 DMask
Bit Description
7Touchscreen Drive test incomplete
5Touchscreen Drive test failed
DMask2 - byte 2
Bit Description
7Microprocessor logic failure
6Internal RAM read/write test failure
5External RAM read/write test failure
4PROM checksum failure
3DAC hardware test failure
2-0 Touchscreen drive test results
000 No failure
001 X-axis failure
010 Y-axis failure
011 X receive channel failure
100 Y receive channel failure
101 X transmit channel failure
110 Y transmit channel failure
111 General failure (touchscreen may not be
connected)
SmartSet Technical Reference Manual—Addendum for the E281-2310 Controller 7
page 88-89 The following combinations of the TouchFlag and Format number
are supported:
Touch Flag Format
‘0’ ‘0’
‘0’ ‘4’
‘0’ ‘6’
‘1’ ‘0’
‘1’ ‘4’
‘1’ ‘6’
page 90
Set or
0 1 2&3 4 5 6 7
Response: ‘F’ Type Rep Ofs MinLen MaxLen
The Rep word specifies the maximum number of times (1-65535)
that a repeating coordinate value is permitted to be measured by the
controller. If the number of times that a coordinate repeats in X, Y,
and Z exceeds this value, then the controller relearns the
touchscreen waveform. This parameter determines the tolerance of
contaminants on the touchscreen. The factory default value is 2432,
which is about 25 seconds.
The Ofs byte specifies the amount (0-255) of surface wave energy
absorption that is recognized as a touch. A small value increases
touch sensitivity. A large value increases noise rejection. The
factory default value is 2.
The MinLen byte specifies the minimum width of a touch (0-255).
As with the previous argument, a small value increases the
sensitivity and a large value increases noise rejection. The factory
default is 2.
The MaxLen byte specifies the maximum width of a touch (0-255).
This parameter controls the rejection of multiple touches and
splattered contaminants. The factory default is 22.
page 91 Not supported.
page 92 Not supported.
SmartSet Technical Reference Manual—Addendum for the E281-2310 Controller 8
page 93 Features byte:
Bit 7 is 1 - Z-axis available.
page 95 X1 is a bitmap specifying which option jumpers are installed:
X1 Bit Position Description
0J0 installed
1J1 installed
2J2 installed
3J3 installed
X2 is a bitmap specifying whether cross-connected jumpers are
installed:
X2 Bit position Description
0jumper connects J0 to J1
1jumper connects J1 to J2
2jumper connects J2 to J3
page 97 Not supported.
page 98 Not supported.
page 99 Mode1:
Bit Description
6Reserved (0)
71 - Z-axis Enable
Mode2:
All bits reserved (0).
page 102 Not supported.
page 104 Not supported.
page 108 Not supported.
page 109 Hard Reset Command: If the host cannot monitor -CTS,
approximately 5 seconds should be allowed for the reset procedure
to take place.
page 110 Not supported.
page 112 Set or query commands are not supported. Touch packets are
generated automatically.
SmartSet Technical Reference Manual—Addendum for the E281-2310 Controller 9
Status bits:
Bit Description
6Reserved (0)
7If 1, the Z coordinate is measured, not
simulated at the maximum value.
SmartSet Technical Reference Manual—Addendum for the E281-2310 Controller 10
E281-2310 SPECIFICATIONS
Electrical
Supply Voltage and Current
+5 Vdc, nominal (+4.75 to +5.25 Vdc).
140 mA, typical at +5 Vdc. Average power dissipation is 0.7 W, typical.
Supply must be capable of sourcing 200 mA, minimum, and have a rise time of less
than 100 ms. Conformance to this specification is yet to be determined.
Total noise and ripple requirement must be less than 100 mV (p-p) for frequencies
below 1 MHz, and less than 5 mV (p-p) for frequencies above 1 MHz.
Interface
EIA 232D (Serial RS-232), DCE configuration. 8 Data Bits, 1 Stop Bit, No Parity,
Half Duplex. Hardware handshaking: DTR/DSR, RTS/CTS.
Acknowledgments for command set and query.
Baud Rate
9600 only.
Operating Modes
Binary in SmartSet or E281A-4002 protocols, jumper selectable.
Initial/Stream/Untouch/Z-axis Enable Modes.
Touch Resolution
Approximately 4095x4095, size independent, 255 levels of Z (pressure).
Conversion Time
Approximately 10.4 ms per coordinate report.
Reliability
MTBF greater than 60,000 hours per MIL-HDBK-217E Notice 1 update part
count calculation. Conformance to this specification is yet to be determined.
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