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6.2.2 Physical specifications of interface signals
The physical specifications of RS-232-C interface signals
con,sist
of electrical
specifications,
interface cable specifications,
and connector pin assignment
specifications.
(1)
Electrical specifications
Signal levels must be within the following ranges:
Low level (off)
-3
v or less
High level (on)
+3
V or more
Note:
These signal levels are measured at the interface connector.
Signals with incorrect levels may be sent at power on and power off.
The interface signal transmitter and receiver must be the same as those
shown in Figure 6.2.
. Transmitter
-12 v
!vfotorola
Semiconductors MCI488 or equivalents
. Receiver
Signal
ground
-----b-
Printer
100 PF
I
lOKS-2
/I
.Mororola
Semiconductors
MCI489
or equivalents
Figure 6.2 RS-232-C interface signal transmitter and receiver
6 -a
B02P-1500-OOOlA...O5