4.3Driver/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.
20 k
To response control pin
100 pF
0 V
4.4Timing
Scanner Host computer (At transmission)
RTS
TXD
CTS
a |
| b |
| c |
| d |
|
|
|
|
|
|
|
a:+0 ms
b:+0 to 5 ms
c:+0 to 10 ms (more than 1 word length)
d:+0 ms
4 - 3 |