Siemens 9015 Manual De Usuario
Use with two interfaces
Interfaces
Programmer Reference Guide
U26169-J-Z716-1-7600
©
S
iem
e
n
s
N
ix
dor
f
In
fo
rm
at
io
n
s
s
y
s
tem
e
A
G
1
995
P
fad:
D:
\S
NI
\M
ac
k
w
it
z
\u
261
69
\o
261
69
e\
26
169
e.
k
1
1
Use with two interfaces
The “Both interfaces active” mode can be selected in the menu (see [2]).
In this mode the printer buffer is subdivided into two parts with 256 bytes each.
After power-on, both interfaces are ready to receive data.
If a byte is received first at the serial interface, the parallel interface is blocked by the
BUSY
signal. The serial interface is active and uses the set protocol.
If a byte is received first at the parallel interface, the serial interface is blocked by the DTR
signal (DTR = OFF) or, depending on the protocol, by transmission of
signal (DTR = OFF) or, depending on the protocol, by transmission of
XOFF
.
A maximum of 256 bytes can be received at the serial interface even though the parallel
interface is active. All further bytes are lost except for the byte received last.
interface is active. All further bytes are lost except for the byte received last.
If the printer buffer of the serial interface is completely free and if no further data is received
within 60 seconds, both interfaces are again available.
within 60 seconds, both interfaces are again available.
If the printer buffer of the parallel interface is completely free and if no further data is
received within 60 seconds, the data of the printer buffer of the serial interface is processed
and the serial interface is activated.
received within 60 seconds, the data of the printer buffer of the serial interface is processed
and the serial interface is activated.