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LR4 Front PanelMACH 1-4 LEDs
Indicate which machine is currently
selected for LARC control.Power
Provides front panel control of
power on/off. LED lights when
power is on.Rear PanelAC Power
Standard 3-pin IEC power connector.
1 0 0 - 1 15 / 2 3 0V , 5 0- 6 0 H z i n t er n a l
switches set voltage.MACH 1-4
DE9 connectors for interface to LARC ports
of Lexicon 224XL, 480L or 300L. LARC
DE9 connector for interface with
LARC (Lexicon Alphanumeric
Remote Control).
Operation
The LR4 Framelink allows a single LARC to communicate with
as many as four LARC compatible Lexicon processors
(224XL, 300L or 480L). Each mainframe can be individually
selected via the LARC and, once selected, operation is
transparent - exactly as though the LARC were directly
connected to that mainframe.
LR4 power up behavior and default machine selection varies
slightly depending on whether machines are connected and
running when the LR4 is powered on, or are connected while
the LR4 is running.
If machines are connected and running when the LR4 is
powered on, the LR4 will go through a brief set of internal
diagnostics tests, then begin successively polling each MACH
port to verify connections. After identifying the machine con-
nected to each port, the LR4 will return to the lowest numbered
port with a connected device and activate LARC control. For
example, LARC control will default to MACH1 if a device is
connected there. If devices are connected only to MACH 3
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Specifications subject to change without notice.LR-4 to Mainframe Cable
When connecting the LR4 to a main-
frame more than 10' away. use proper
RS422, shielded 9-conductor cable,
wired as shown to two 9-pin D-sub
connectors (male).LR-4 to LARC Cable224XL, 480L or 300L224XL, 480L or 300L224XL, 480L or 300L224XL, 480L or 300LDimensions19.0"W x 1.75"H x 4"D (483x45x102mm) 19" rack mount standard, 1U high
WeightNet weight: 2.75lbs (1.24kg)
Shipping weight: 3.75lbs (1.7kg)
Power Requirements100/115VAC, -5/+10% or 230VAC, +10%, 50-60 Hz, 10W (Factory set)
Connectors3-pin IEC power connector
Rear Panel Connectors5 female DE-9 connectors, RS-422 serial communication, 9600 Baud
Front Panel Control5 LEDs, AC power switch
EnvironmentOperating Temperature: 32° to 95°F (0° to 35° C)
Storage Temperature: -22° to 167°F (-30° to 75°C)
Humidity: 95% max without condensationSpecifications At the beginning of either identification cycle, the LARC will
display the message SEARCHING FOR MAINFRAME in the
upper display, and the port currently being addressed in the
lower display. One of the LR4 LEDs will light to indicate the
MACH port under interrogation. Once the mainframe con-
nected to that port is identified, the LARC will display the
machine identity and address this mainframe as if directly
connected.
To select another machine for LARC control, press and hold
MACH, then immediately press 1, 2, 3 or 4 to select the device
you want. If you do not press a numbered key, the LR4 will
interrogate and identify the current port and return it to active
status. (If you do not hold MACH
