Symbol LS 1220, Product Reference Manual

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1-7
Introduction
Electrical Interface
Table 1-1 lists the pin functions of the LS 1220 interface.
Table 1-1. Electrical Interface
Pin
No. Pin Name Type Function
1 Trigger* I This pin is normally pulled high. When this pin is grounded, the
scan module begins scanning.
2 TxD O Serial data transmit output. It drives the serial data receive
input on the device communicating with the scanner.
3 RxD I Serial data receive input. It is driven by the serial data transmit
output on the device communicating with the scanner.
4 Aim* I This pin is left floating, or pulled high for the standard and wide
angle LS 1220s, models during normal scanning.
5 Ground Power supply input ground pin and reference for both output
signals. It must be capable of sinking all return current.
6 Power 5.0 VDC ± 5%
7 CTS* I Clear-to-send handshaking input line. It may be optionally used
by another device to signal the scanner that it may commence
transmitting data. It can be used only in conjunction with the
RTS line.
8 RTS O Request-to-send handshaking output line. It may be optionally
used by the scanner to signal another device that data is
available to send. It can only be utilized in conjunction with the
CTS line.
9 Beeper* O This is an open collector beeper output that can sink 50 mA
maximum. Output frequency 2.5 kHz nominal, 50% duty cycle.
* Active Low, I = Input O = Output