2
DESCRIPTION (Cont’d)
A powerful feature of the MDI is the Message Queue. With the Queue
function disabled, the MDI processes messages on a first-come, first-served
basis. However, with the Queue function enabled, the MDI processes message
requests on a prioritized basis. High priority messages are placed on the Display
while lower priority messages are placed on the Queue for later processing in
priority order.
The metal front bezel of the MDI meets NEMA 4/IP65 requirements,
allowing for washdown when properly installed. Modern surface-mount
technology and extensive testing make the unit extremely reliable in industrial
environments. Connections are made on removable terminal blocks,
simplifying installation.
SAFETY SUMMARY
All safety related regulations, local codes and instructions that appear in the
manual or on equipment must be observed to ensure personal safety and to
prevent damage to either the instrument or equipment connected to it. If
equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
SPECIFICATIONS
1. POWER: (See Ordering Information)
AC Version:
115/230 VAC ±10%, 50/60 Hz, 8 VA, switch selectable.
DC Version:
12/24 VDC ±10%, 300 mA max., terminal selectable. Power supplies
must be Class 2 or SELV rated.
2. DISPLAY: (available in various configurations)
2x20: 0.2" (5 mm) high characters.
1x10: 0.35" (9 mm) high characters.
3. PARALLEL COMMUNICATIONS:
Message Format:
Binary: 4 or 8 bits.
BCD: 4, 8, or 9 bits.
Embedded Data Format:
Binary: 4 or 8 bits.
BCD: 4 or 8 bits.
ASCII: 4 or 8 bits.
PARALLEL PORT INPUTS:
Data Inputs (D0 - D7) & Control Inputs (Strobe & Message/Data):
VIH = 8 VDC min., VIL = 4 VDC max., VMAX = 30 VDC
Data SNK/SRC: Sink or Source, switch selectable.
Control SNK/SRC: Sink or source, switch selectable.
Data Logic Level: Positive or negative, switch selectable.
Control Logic Level: Positive or negative, switch selectable.
Current Sinking: Internal 10 KΩpull-up, IMAX = 1.2 mA.
Current Sourcing: Internal 10 KΩpull-down, IMAX=3.1 mA @ 30 VDC.
Debounce Time: 0.01 to 2.5 seconds (programmable).
Strobe Time: 3 to 255 msec (programmable).
4. SERIAL COMMUNICATIONS: 20 mA current loop, full-duplex.
Data Format: Four types available. switch selectable.
11 bits: 1 start bit, 8 data bits, 1 parity bit, 1 stop bit.
10 bits: 1 start bit, 8 data bits, 1 stop bit.
10 bits: 1 start bit, 7 data bits, 1 parity bit, 1 stop bit.
9 bits: 1 start bit, 7 data bits, 1 stop bit.
Data Code: ASCII
Unit Address: Programmable from 0 to 99. (The number of units in a single
loop is limited by the hardware specifications.)
Baud Rate: 300 to 19200, switch selectable.
Parity: Enable or Disabled, switch selectable.
Even/Odd: Selects parity type, switch selectable.
7/8 BIT: Data Bits, switch selectable.
Serial Hardware: Terminal TBA.
+20 mA SRC: Provides 20 mA @ 12 VDC.
Note: Can power up to 6 units in a loop.
-20 mA SRC: Loop return for +20 mA SRC.
SO/Output Transistor Rating: VMAX= 30 VDC, VSAT = 1 VDC @ 20 mA.
Note: Transistor rating allows for up to 28 units in a loop.
SI/Input Diode Rating: VF= 1.25 VDCTYP; 1.5 VDCMAX @ 20 mA.
Note: The compliance voltage rating of the source must be greater than
the sum of the diode voltage drops around the loop. Typically a 30 VDC
source (with adequate current capability) is capable of operating
between 18 and 22 units in a loop.
5. OUTPUT/BUSY PIN:
Solid State: NPN open collector, current sinking, VMAX = 30 VDC, IMAX =
100 mA, VSAT = 1 VMAX @ 100 mA.
Busy Mode: Indicates the Ready/Busy status of the unit.
Output Mode: Output is activated from a Command or Message for a
specified time out value.
Time Out: 10 msec to 63 mins or Latched.
6. REAL-TIME CLOCK: Non-volatile Date and Time, accurate to ±1
minute/month.
7. MEMORY: Non-volatile memory retains all programmed Configuration,
Message, and Character settings when power is removed or interrupted.
32K: Provides space for 256 Messages of 100 bytes each while capable of
storing 4 K bytes of Embedded Data.
8. ENVIRONMENTAL CONDITIONS:
Operating Temperature: 0 to 50°C
Storage Temperature: -20 to 60°C
Operating and Storage Humidity: 85% max. relative humidity (non-
condensing) from 0°C to 50°C.
Altitude: Up to 2000 meters
9. CERTIFICATIONS AND COMPLIANCES:
UL Recognized Component, File#E171375
Recognized to U.S. and Canadian requirements under the Component
Recognition Program of Underwriters Laboratories, Inc.
ELECTROMAGNETIC COMPATIBILITY
Notes:
1. Metal bezel of unit connected with ground lead from rear bezel screw to
metal mounting panel.
2. For operation without loss of performance:
I/O cables are routed in metal conduit connected to earth ground.
3. For operation without loss of performance:
Install power line filter, RLC#LFIL0000 or equivalent.
Refer to the EMC Installation Guidelines for additional information.
10. CONSTRUCTION: Metal front bezel meets NEMA 4/IP65 specifications
for indoor use when properly installed. Installation Category II, Pollution
Degree 2. Case is black high impact plastic (panel gasket, mounting clips and
screws included).
11. CONNECTIONS: Removable terminal blocks.
12. WEIGHT: 1.1 lbs (0.5 Kg).
BASIC OPERATION
The MDI performs two basic functions; it processes Messages and executes
Commands. The MDI begins processing a Message in response to a request for
that Message. In processing the Message, the MDI performs the functions the
user has specified for that Message. A Message may specify any combination
of the following functions:
1) Display Text Locally: The MDI displays the Message Text, which can
include the Current Time and Date, Elapsed Timer values, and Embedded
Data items.
2) Display Text Remotely: The MDI transmits the Message Text to an RLC
Message Display Slave (MDS) unit for Display.
3) Transmit Text: The MDI transmits the Message Text, which can also
include ASCII control codes, over the serial port to a computer, serial printer,
or ASCII terminal.
4) Configure Elapsed Timers: The Message can access one or more of the
MDI’s sixteen Elapsed Timers.
5) Collect Embedded Data: The Message can collect up to fifteen Embedded
Data items.
6) Configure the Output Pin: The Message can access the MDI’s Output Pin
function.
See the Message section for descriptions of the Message features.
A full set of Commands is available for configuring the MDI to the user’s
application. Two methods are available to the user for issuing Commands to the
MDI. A Command string can be issued directly over the Serial Port, or a
Message can be programmed containing the desired Command string
(Command Message). In this case, the MDI executes the Command when the
Message containing the Command is requested.
See the Command section for descriptions of the available Commands.
Simulation of cordless telephone ENV 50204 Level 3; 10 V/m
Immunity to EN 50082-2
900 MHz ±5 MHz
200 Hz, 50% duty cycle
Electrostatic discharge EN 61000-4-2 Level 2; 4 Kv contact 1
Level 3; 8 Kv air
Electromagnetic RF fields EN 61000-4-3 Level 3; 10 V/m
80 MHz - 1 GHz
Fast transients (burst) EN 61000-4-4 Level 4; 2 Kv I/O 2
Level 3; 2 Kv power 3
RF conducted interference EN 61000-4-6 Level 3; 10 V/rms 3
150 KHz - 80 MHz
Emissions to EN 50081-2
RF interference EN 55011 Enclosure class A
Power mains class A
