254764-001 Rev B 12
Communication Sync Commands
Sync operation can be accomplished through serial communications. Please see the ~SK command for
details.
Output Ports
Five programmable output ports are available on I/O connector pins 5, 6, 7, 8, and 15. Each port can be
programmed to activate on practically any combination of data and analysis parameters (including “good
codes”) analyzed by the SV 2 Series. Port activation logic and parameters are programmed via the output
interface modes and associated commands. See the Output Interface Modes Descriptions section for details.
Each port’s output is an open drain FET (field effect transistor). Therefore, the port can either be “ON”
(sinking current) or “OFF” (no current/open circuit.) The active polarity determines whether the port is
“ON” or “OFF” while active. This type of output circuit is used because it is flexible for field connections.
Figure C3 shows an example circuit diagram of one output port.
Figure C3 – Open Drain FET Output Diagram
SYSTEM DISPLAYS
Five LED’s are included on the SV 2 Series back panel.
Power (Sync) LED
This LED is illuminated green whenever power is applied to the SV 2 Series. Upon receipt of any sync
input (hardware or serial communications) the LED will blink red for approximately 100 milliseconds.
Calibration LED
This yellow LED indicates calibration status. Please refer to the Calibration Section for details.
Read LED
This green LED is illuminated whenever a bar code is being fully decoded.
Indicator LED’s 1 and 2
These two green LED’s are user programmable exactly like the five output ports. Their functions are
intended for use as indicators for specific analysis results.
A common example is LED 1 programmed to illuminate in latch mode whenever a symbol quality error is
detected, while LED 2 is programmed to illuminate in latch mode whenever a No Read error is detected.
To appropriate output pin 5, 6, 7, 8, or 15
To SV ground
From SV output logic
