InfoPrint 6500 Series, Руководство пользователя

Страница: 217 / 360

RS-422
217
Receive Data (RXD) . Serial data stream to the printer.
Clear To Send (CTS) . Status signal to the printer indicating the host is ready
to receive data/status signals from the printer.
Data Set Ready (DSR) . Status signal to the printer indicating the host is in a
ready condition.
Data Carrier Detect (DCD) . Status signal to the printer. The ON condition is
required for the printer to receive data.
Transmit Data (TXD) . Serial data stream from the printer for transmitting
status and control information to the host. Subject to protocol selection.
Request To Send (RTS) . Control signal from the printer. Subject to
configuration.
Data Terminal Ready (DTR) . Control signal from the printer. Subject to
configuration.
RS-422
6500-V Models
NOTE: The RS-422 is optional.
+RXD, -RXD .Serial data stream differentially received by printer.
+TXD, -TXD .Differentially driven serial data stream for transmitting status and
control information to the host. Subject to protocol selection.
NOTE:
±
RXD and
±
TXD form signal and return paths of a differential line
signal.
RS-232 Serial Interface Protocols
DTR . (DTE Ready). The printer controls the data flow by asserting or de-
asserting this hardware signal to the host. If there is enough room in the
printer buffer, the printer will send a high signal; if the buffer is full the printer
will send a low signal. DTR tells the host if it is safe to send more data (If the
host sends data during an unsafe condition, data will be lost.
Table 5. RS-422 Serial Interface Connector Pin Assignments
Input Signals Output Signals Miscellaneous
Signal Pin Signal Pin Signal Pin
- Receive Data
(-RXD)
1 - Transmit Data
(-TXD)
3 Chassis/Signal
Ground 5
+ Receive Data
(+RXD)
6 + Transmit Data
(+TXD)
8