2
1-1
Front Panel
On the front panel of the ASCII Unit, there are six indicator lights, the reset
switch, the START/STOP switch, two RS-232C connectors, and a battery com-
partment. In addition, behind the LED Display Panel, is an 8-pin DIP switch used
for setting various control parameters.
Ports
The front panel of the ASCII Unit contains two RS-232C ports. These ports
are used for connecting peripheral I/O devices to the ASCII Unit. Both ports
can be used for communication devices such as printers, terminals, and mo-
dems. Only port 1 can be used for uploading or downloading a BASIC pro-
gram. The standard configuration is a personal computer connected to port 1
and a printer or other I/O device connected to port 2.
Switches
The START/STOP switch is a toggle switch and is used for initiating and halt-
ing execution of the ASCII Unit program.
The RESET switch is used for resetting the ASCII Unit.
Battery Compartment
The battery compartment holds the C500-BAT08 Battery.
Front Panel
LED display
Indicates the operating
status of the ASCII Unit.
RESET switch
Resets the ASCII Unit
START/STOP switch
Starts/stops BASIC
program execution.
DIP switch
DIP switch is visible when the
indicator panel is removed.
RS-232C connector port 1
Connects peripheral devices. Is generally
used to input the BASIC program but can be
used for other peripheral devices as well.
RS-232C connector port 2
Connects peripheral devices. Cannot be
used to input a BASIC program. Is generally
used for a printer or other RS-232C devices.
Battery compartment
Holds the C500-BAT08 Battery.
The following table describes the ASCII Unit’s indicators.
Name
Indication
Function
RUN
Lit (green)
Lit when the ASCII Unit is operating normally. Unlit if an error
occurs.
T/R for ports 1 and 2
Blinking (green)
Blinks during data transmission (port 1 and port 2).
ERROR 1 (port 1)
ERROR 2 (port 2)
Lit (red)
Lit if a reception buffer overflows or an error such as parity error
occurs (see note), or while the ASCII Unit is waiting for specific
transmission conditions to be satisfied.
BASIC
Lit (green)
Lit while the BASIC program is running.
Blinking (green)
Blinks when the BASIC program stops, or when the ASCII Unit is
waiting for input while the BASIC program is running.
Unlit (green)
Unlit when in monitor mode.
BAT ERR
Blinking (red)
Blinks when the battery voltage has fallen below the rated level or
if the battery is not inserted correctly.
4CH
Lit (green)
Lit when the ASCII Unit is set for 4-word mode. Unlit when the
ASCII Unit is set for 2-word mode.
Indicator LEDs
Front Panel
Section 1-1
Summary of Contents for C500-ASC04
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