Oki OKIPOS T410DT-Parallel Users Guide - Page 142

X-on/x-off Flow Control

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notifies the host when it is ready to receive data. Pin 4 (RTS) and pin 20 (DTR) are the important signals on the printer for this method of flow control. The host must be capable of supporting this flow control method for to function properly. X-On/X-Off FLOW CONTROL X-On/X-Off flow control is used whenever hardware (Ready/Busy) flow control is not available or desirable. Instead of a voltage going high/low at pin 20, control characters representing "Printer Ready" (X-On =11 hexadecimal) or "Printer Busy" (X-Off = 13 hexadecimal) are transmitted by the printer on pin 2 (Transmit Data) to the host. In order for this method of flow control to function correctly, the host must be capable of supporting it. X-On/X-Off operates in a manner similar to the function of pin 20 (DTR) as previously explained. When the printer is first powered on it sends an X-Off when the "Buffer Near Full" level is reached and an X-On when the data level of the buffer drops below the "Buffer Available" mark. When the printer is taken off-line manually, it transmits an X-Off indicating it cannot accept data. When it is placed back on line manually, it sends an X-On, indicating it is again available for receipt of data. If an error occurs during printing (paper out, ribbon out), the printer sends an X-Off as soon as an error condition is detected. When the error is cleared and the printer is placed back online, it transmits an X-On indicating it is again ready to accept data. Upon power up if no error conditions are present, the printer will continually send X-On characters at five millisecond intervals until it receives a transmission from the host. Data Streams The data streams for X-On/X-Off and Ready/Busy flow control are constructed in the same way as they are for Ready/Busy flow control. A . . Job#1 . . ZA . . Job#n . . Z Example: A . . Job#1 . . Z NOTE: All characters are in ASCII. UNIVERSAL SERIAL BUS (USB) OPTIONAL INTERFACE The Universal Serial Bus (USB) interface is a factory installed option that must be specified at the time of order. When it is installed, the printer can be configured to receive data through the IEEE 1284 parallel interface or the optional USB interface. It requires a driver (shipped with each printer that has the interface installed) that must be loaded on your PC and the PC must be configured to support USB peripherals using Windows 98. Details for loading the USB driver are contained in the USB Interface Manual that is shipped with each printer with a USB Optional interface installed. Up to 127 devices may be connected to a USB port. 133

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133
notifies the host when it is ready to receive data. Pin 4 (
RTS
) and pin 20 (
DTR
) are the important
signals on the printer for this method of flow control. The host must be capable of supporting this
flow control method for to function properly.
X-On/X-Off FLOW CONTROL
X-On/X-Off
flow control is used whenever hardware (Ready/Busy) flow control is not available
or desirable. Instead of a voltage going high/low at pin 20, control characters representing “Printer
Ready”
(X-On
=11 hexadecimal) or “Printer Busy” (
X-Off
= 13 hexadecimal) are transmitted by
the printer on pin 2 (Transmit Data) to the host. In order for this method of flow control to
function correctly, the host must be capable of supporting it.
X-On/X-Off
operates in a manner
similar to the function of pin 20 (
DTR
) as previously explained. When the printer is first powered
on it sends an
X-Off
when the “Buffer Near Full” level is reached and an
X-On
when the data
level of the buffer drops below the “Buffer Available” mark. When the printer is taken off-line
manually, it transmits an
X-Off
indicating it cannot accept data. When it is placed back on line
manually, it sends an
X-On
, indicating it is again available for receipt of data. If an error occurs
during printing (paper out, ribbon out), the printer sends an
X-Off
as soon as an error condition is
detected. When the error is cleared and the printer is placed back online, it transmits an
X-On
indicating it is again ready to accept data.
Upon power up if no error conditions are present, the printer will continually send
X-On
characters at five millisecond intervals until it receives a transmission from the host.
Data Streams
The data streams for
X-On/X-Off
and
Ready/Busy
flow control are constructed in the same way
as they are for Ready/Busy flow control.
<ESC>A . . Job#1 . . <ESC>Z<ESC>A . . Job#n . . <ESC>Z
Example: <ESC>A . . Job#1 . . <ESC>Z
NOTE: All characters are in ASCII.
UNIVERSAL SERIAL BUS (USB) OPTIONAL INTERFACE
The Universal Serial Bus (USB) interface is a factory installed option that must be specified at the
time of order. When it is installed, the printer can be configured to receive data through the IEEE
1284 parallel interface or the optional USB interface. It requires a driver (shipped with each
printer that has the interface installed) that must be loaded on your PC and the PC must be
configured to support USB peripherals using Windows 98. Details for loading the USB driver are
contained in the USB Interface Manual that is shipped with each printer with a USB Optional
interface installed. Up to 127 devices may be connected to a USB port.