Siemens 9015 Manual De Usuario
V.24/RS-232 C
Interfaces
Programmer Reference Guide
U26169-J-Z716-1-7600
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DTR protocol
The following signal lines are used:
The printer sets the DTR signal to ON (positive level) as soon as it is ready to receive data
after power-on.
after power-on.
The printer sets the DTR signal to OFF when less than 256 bytes are free in the buffer or
when the printer enters the Stop mode. Further data is stored until the printer buffer is
completely full; any additional data is lost.
when the printer enters the Stop mode. Further data is stored until the printer buffer is
completely full; any additional data is lost.
The DTR signal returns to ON when the printer exits from the Stop mode and at least 512
bytes are free in the printer buffer.
bytes are free in the printer buffer.
Designation
Explanation
Direction
from/to printer
from/to printer
Pin
EIA
DIN
CCITT
1
3
7
20
3
7
20
AA
BB
AB
CD
BB
AB
CD
E1
D2
E2
S1.2
D2
E2
S1.2
101
104
102
108.2
104
102
108.2
PG: Protective Ground
RXD: Receive Data
SG: Signal Ground
DTR: Data Terminal Ready
RXD: Receive Data
SG: Signal Ground
DTR: Data Terminal Ready
x
x