Signals
61
nReverse Request.
Driven by the host. Resets the interface and forces a
return to Compatibility Mode idle phase.
nData Available / nPeripheral Request.
Driven by the printer. Indicates the
printer has encountered an error. (Data bits 1 and 5 in Nibble Mode.)
1284 Active / nAStrobe.
Driven by the host. A peripheral device is selected.
Host Logic High.
Driven by the host. When set to high, the host indicates all
of its signals are in a valid state. When set to low, the host indicates its power
is off or its signals are in an invalid state.
nInit.
Resets init interface from the host.
RS-232 Serial Interface
NOTE:
The RS-232 serial interface circuit characteristics are compatible with
the Electronic Industry Association Specification EIA
®
-232-E.
The RS-232 serial interface enables the printer to operate with bit serial
devices that are compatible with an RS-232 controller. The input serial data
transfer rate (in baud) is selectable from the printer's control panel. Baud rates
of 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200 are
available.
The length of the data cable from the host computer to the printer must not
exceed 50 feet (15 meters) for RS-232
Received Data (RXD).
Serial data stream to the printer.
Transmitted 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.
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.
Table 7. RS-232 Serial Interface Connector (9 Pin) Assignments
Input Signals
Output Signals
Miscellaneous
Signal
Pin
Signal
Pin
Signal
Pin
Receive Data (RXD)
2
Transmit Status & Control
Data (TXD)
3
Chassis/Signal Ground
5
Clear To Send (CTS)
8
Request To Send (RTS)
7
Data Set Ready (DSR)
6
Data Terminal Ready (DTR)
4
Data Carrier Detect (DCD)
1
RS-232 Serial Interface
