User's Manual

OBID i-scan

Installation ID ISC.ANT.MUX
FEIG ELECTRONIC GmbH Page 27 of 37 M30201-1de-ID-B.doc
E N G L I S H
8.4. X2: Input (Opto-Coupler)
The digital input on terminal X2 is used to trigger the multiplexer in the External-Trigger mode. The
opto-coupler input is galvanically isolated from the antenna multiplexer and must therefore be
externally supplied with DC voltage. The input LED on the opto-coupler is internally connected to a
series resistor whose value is adjustable using jumpers JP11 and JP12 (s. Figure 4). The input-
current should be between 10mA and 20mA. Set the jumpers according to Table 1 depending on
the input voltage.
Table 1: Jumper settings for opto-coupler input
ext. voltage U
ext
R
int
JP19 JP20
5V – 8V
350 Ω
In In
8V – 12V
500 Ω
In Out
12V – 24V
1,2 kΩ
Out In
Figure 4: Input
The trigger signal on input X2 must lie within the limits shown in Figure 5. With higher frequencies
it is recommended that the trigger signal and the transponder protocols be synchronized to prevent
the connection between the reader and data carrier from being interrupted while a transponder is
being read.
Figure 5: Pulse for external trigger
X2
1,2 k
500
JP20
JP19
t
b
U
p
U
t
t
b
: 1 – 100ms
t
p
: > ( t
b
+ 1ms )
U
p
: 5 – 24V
DC
t
p