
7156 Owner’s Guide Communication
October 1995 61
Communication
Communication Overview
In order for a receipt or slip to be printed, a program must be in place that
translates the data from the host system into a language that the printer can
understand. This program must tell the printer exactly how to print each
character. This chapter describes how to create such a program or modify an
existing one.
Interface
In order for the printer to communicate with the host, a communication link must
be set up. The 7156 supports the industry standard RS-232C communication
interface. This interface has a protocol associated with it that the host system
must understand and adhere to.
Only when the interface parameters are matched and the proper protocol is used
will the host and the printer be able to communicate. See the section, “RS-232C
Interface” on the next page for a description of the protocol associated with the
RS-232C interface.
Sending Commands
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.
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