Epson PX-8 Technical Manual page 134

REV.-A
2.12.4 Circuit Operation
The interface allows the following full-duplex data transmission between the computer and the
connected device:
Number of start bits:
Data length:
Number of stop bits:
Parity:
1 bit
8 bits
1 bit
Not used.
The POUT and PIN signals, which respectively, indicates whether the computer (or the connected
device) is in the transmit or receive state. However, these signals will rary depending on the con-
nected device and/or the application program used in the computer. See Fig. 2-114.
Computer
Connected device
POUT
Control signal
-'"
PIN
--1
,
PTX
Transmitted data
PRX
,
Control
Received data
circuit
PRX
PTX
PIN
...-
Status (Ready) signal·
POUT - -
J
,..
Fig. 2-114 Serial Interface Signals
2-110