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4.3 Driver/Receiver
Driver: SN75188 or equivalent
Receiver: SN75189 or equivalent
To determine the threshold level of the signal at the receiver, the following circuit
must be connected to the response control pins.
100 pF
0 V
-12 V
To response control pin
20 k
4.4 Timing
Scanner Host computer (At transmission)
RTS
TXD
CTS
ab cd
a: +0 ms
b: +0 to 5 ms
c: +0 to 10 ms (more than 1 word length)
d: +0 ms
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