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(1)
Selecting voltage and current loop interfaces
EIA DB-25, the connector for RS-232C, can be used for both
voltage and current loop interfaces.
Both interfaces are
selected by the RS-232C current loop jumper.
The initial
setting is the RS-232C interface.
(2)
EIA level driver and receiver
a)
Transmission/receiving level converter circuit
This circuit converts the TTL level signal to the voltage
level specified in RS-232 V.24.
+5V
+12V
-l2V
+ Te
T
|
8
5
ee
2 |
|
|
882
7
=
75150
|
|
|
|
Le —
B25!I1A
tov
Peripheral Device
canon
NC
ie)
2
cee eae 7
|
[
12 |
[5
_
i]
{
—
75154 |
|
Lee |
Figure 5-70
Voltage Interchange Circuit
II - 99
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Troubleshooting
