NCR 7158, Руководство пользователя, Страница: 119 / 314

Chapter 6:
Communication Interface
Communication Overview
In order for the printer to communicate with the host, a
communication link must be set up. The 7158 printer supports either
the RS-232C or USB interfaces.
The RS-232C interface has a protocol associated with it that the host
must understand and adhere to. Only when the interface parameters
match and the proper protocol are used will the host and the printer be
able to communicate.
Once the communication link is established, commands can be sent to
the printer. This section describes how to send commands to the
printer using DOS and BASIC. This section does not take into account
the necessary protocol, but is meant as a general introduction to how
the printer functions.
Using DOS to Send Commands
One way of getting commands to the printer is to send them directly
from DOS. Use the following DOS command do this.
COPY CON: COM1:
This sets the computer up so the hexadecimal code corresponding to
any key pressed is sent to the communication port COM1 when the
COPY mode is exited. If the printer is connected to COM1, then the
data will go to the printer.
Exit the COPY mode by typing:
CTRL Z [Enter]
Software programs can now write data to the COM1 device.