Printronix P9000 Series, User'S Reference Manual

Page: 176 / 334

Interfaces 7-6
150, 300, 600, 1200, 2400, 4800, 9600, 19200, or external control are available. Baud rates are
selected from the control panel; external control is selected by jumper configuration on the
DCU board as described in Appendix F, Hardware Jumper Configuration.
The input format consists of a single start bit, 7 or 8 data bits, and one or two stop bits. The
operator can set the number of data bits from the control panel. The data bits are interpreted
with the least significant bit first. The operator can also set parity checking via control panel.
The printer interface uses a first-in/first-out buffer with the size selectable from the control
panel. The asynchronous interface accepts data as it is provided by the host computer. The
maximum cable length from the host computer to the printer is 50 feet (15 meters). The interĆ
face circuit characteristics are compatible with the Electronic Industry Association SpecificaĆ
tion (EIA-RS-232C).
RS-232 Interface Signals
The RS-232 connector is a 25 pin DB-25S type. The mating connector is a DB-25P. Signal
Pin assignments are listed in Table 7-4. RS-232 compatible serial interface signals between
the computer and the printer are defined following the table.
Table 7-4. Serial Interface Pin Assignments
INPUT SIGNALS OUTPUT SIGNALS
SIGNAL PIN SIGNAL PIN
Received Data
Clear To Send
Data Set Ready
Carrier Detect
Transmit Clock
Receive Clock
External Clock
Transmitted Data
Request To Send
Data Terminal Ready
Chassis Ground
Reverse Channel
Signal Ground
3
5
6
8
15
17
25
2
4
11,14
20
1
7
Received Data - Serial data stream to the printer.
Transmitted Data - Serial data stream from the printer for transmitting status and control inĆ
formation 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. When CTS is enabled, DSR and CTS must both be asserted for
the printer to transmit flow control characters to the host.
Data Set Ready (DSR) - Status signal to the printer indicating the host is in a ready condition.
DSR is ignored unless CTS or CD are enabled.
Carrier Detect (CD) - Status signal to the printer. The ON condition is required for the printer
to receive data. Available as a configuration setup option. When CD is enabled, the host must
assert both DSR and CD for the printer to accept data.
Reverse Channel - Control signal from the printer. Subject to configuration.