Sharp MZ-5500 - Input;Output Si~Nals and Control Signals

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10-2. Input/output signals and control signals
( 3
(1) Data input/output signals
Pin
No.
2
3
Signal
name
Transmit signal
Receive signal
Signal
symbol
SD(TxD)
RD(RxD)
In/Out
Out
In
Funetion
Output
data
Input data
from '
deviee
t
Those in parentheses are the ElA symbols.
(2) Contro} signal~
Pin
No.
Signal
name
Signal
symbol In/Out
Funetion
Si.gnal ground
SG
4
Send request
RS (RTS) Out..
ON during data transmission.
OFF when trapsmission is
completed.
5
Trallsmit enable CS(CTS) In The signal with which data
output is permitted.
Data transmission is enabled
when ON.
Data trnnsmission is disabled
when OFF.
NOTE: Even when the signal 1S
turned OFF from ON, a maximum
of 2 bytes of data may be
sended until transmission is
eompleted .
6
Receive enable READY
(DTR)
Out
The
signal whieh indicates
whether data input is enabled.
ON: Enabled.
OFF: Disabled.
7
Signal ground
SG
8
Data set ready DR(DCD) In
The signal whieh indieates
whether the devi.ce is ready
for the operation.
ON: Operation enabled .
OFF:
Operation not · enabled.
When this signal goes OFF
during the data input/output, '
it results in nn error.
9
Signal ground
SG
1 2
Terminal ready ER Out
The si . gnal which indicates
that the powßr is on to the
machine.
ON: Power on state