Intermec 073292-001 用户手册
Chapter 4 — Theory of Operation
Tethered Scanner Signal Descriptions
Pin
Signal Name
Scanner Signal
Description
1
Vext
+5V in
Switched scanner power: Selectable (flex option) as either:
•
5 VDC
±
5% @ 250mA maximum continuous (default)
•
Switched off when the CK30 suspends, and on low-battery.
Can be configured to stay on during Suspend, but is shut off
by hardware if the battery is critically low or removed.
by hardware if the battery is critically low or removed.
Using a different tethered scan flex, this voltage can be changed
to:
to:
•
3.3 VDC
±
5% @ 150mA maximum continuous
2
GND
GND
3 Trigger*
Trigger
Active-low bi-directional trigger signal. This is an open-drain
line driven and sensed by the FPGA (under application software
control) and the scanner’s trigger.
line driven and sensed by the FPGA (under application software
control) and the scanner’s trigger.
•
5V-tolerant 3.3V CMOS input and open-drain output. 20K
pull-up to SCAN_VCC.
4
Lasenable/Scan_RTS*
Enable
Active-low laser enable output to tethered scanners. For decoded
scanners, this signal becomes an active-low, TTL level, serial
RTS handshake. 3.3V CMOS output. Tri-stated when
SCAN_PWR_EN is off or SCAN_PORT = 1. Can be driven in
an open-drain mode (software selectable).
scanners, this signal becomes an active-low, TTL level, serial
RTS handshake. 3.3V CMOS output. Tri-stated when
SCAN_PWR_EN is off or SCAN_PORT = 1. Can be driven in
an open-drain mode (software selectable).
5 Beep
Beep
Beep output to tethered scanners. 3.3V CMOS output. Tri-
stated when BEEP_EN is off.
stated when BEEP_EN is off.
6
Shield
GND
7 Video*/Scan_RxD* Video
Bar code video input from non-decoded scanners. Active-high
or low: only transitions are sensed.
or low: only transitions are sensed.
•
5V-tolerant 3.3V CMOS Schmitt trigger input. 4.75k pull-
up to SCAN_VCC.
For decoded scanners, this signal becomes a TTL level serial
RxD input.
RxD input.
•
5V-tolerant 3.3V CMOS input. 4.75k pull-up to
SCAN_VCC.
•
0 = 0 or space state
•
1 = 1 or marking state
8
SOS/Scan_CTS*
SOS
SOS (Start of Scan) marker from laser scanner. For decoded
scanners, this signal becomes an active-low, TTL level, serial
CTS handshake. 5V-tolerant 3.3V CMOS input. 20K pull-up
to SCAN_VCC.
scanners, this signal becomes an active-low, TTL level, serial
CTS handshake. 5V-tolerant 3.3V CMOS input. 20K pull-up
to SCAN_VCC.
9
GoodRead/Scan_TxD
*
*
Decode LED
Active-low bar code “Good Read” output to tethered scanners.
For decoded scanners, this signal becomes a TTL level serial
TxD output.
For decoded scanners, this signal becomes a TTL level serial
TxD output.
•
3.3V CMOS output. Tri-stated when SCAN_PWR_EN is
off or SCAN_PORT = 1. Can be driven in an open-drain
mode (software selectable).
mode (software selectable).
•
0 = 0 or space state
•
1 = 1 or marking state
10
NC
NC
No connection.
84
CK30 Handheld Computer Service Manual