Signal Levels - Oki Microline 3390 User Manual

MARK Polarity: -3 to -15V:
SPACE Polarity: +3 to +15V: HIGH = ON = Logical "0"
Input circuit
Equivalent to SN 75 154
Input
Eingang
Eingang
Input
300 ns
Ausgangsschaltung
Output circuit
Equivalent to SN 75 188
Eingang
Input
Output
Ausgang
300 ns
With this protocol, the printer uses the voltage level on line RTS (4),
SSD (11) or DTR (20) to inform the computer whether it is ready to
receive data or whether its buffer is full. You can set the Busy line to
one of above mentioned lines by selecting Busy Line. When the printer
is ready to receive data, the Busy-line DTR or RTS is set to high-level
(Space). If you select Busy Line to SSD-, line SSD is also set to high-
level (Space) when the printer is ready to receive data. If you select
SSD+, the line is set to low-level (Mark).
With this protocol the printer uses the line Transmit Data TD (2) and
the command X-ON (DC1) to inform the computer that it is ready to
receive data. The command X-OFF (DC3) is used to inform the compu-
ter that the printer buffer is full.
LOW = OFF = Logical "1"
p
Empfänger
Receiver
+ 3 v
- 3 v
300 ns
Entspricht SN 75188
Sender
Transmitter
+ 3 V
- 3 V
300 ns
Appendix D: Interface Data
Output
Ausgang
+ 15 V
- 15 V
Output
Ausgang
+ 9 V
- 9 V

Signal levels

Circuits
Ready/Busy
protocol
X-ON/X-OFF
protocol
D-7