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C - 1
Appendix C - RS-232
Introduction
This appendix contains detailed information for interfacing with your
PatrionPlus system through an external device such as a scale, scanner, or
PLC. With an external device, you can control and monitor the system as
well as send data to update text in a message that you are printing.
For hardware setup instructions for an external device, see “Optional
External Devices” on page 3-26.
Glossary
Following are some common interfacing terms:
Asynchronous
— A communications channel in which no timing
information is transferred between the DTE and the DCE.
Baud
— Unit of measure representing the speed in bits per second (bps)
that data is transmitted and received. The baud rate setting for two
communicating devices must be the same.
bps
— Bits per second. The number of binary digits (data bits) transferred
per second.
Communications Protocol
— Sets forth the rules for communication
between two devices; for example, baud, parity, data bits, stop bits. Before
either of the two devices can successfully communicate, each device must
be configured in the same manner for each rule.
CR
— Carriage return
CTS
— Clear to Send
DCD
— Data Carrier Detect
DCE
— Data Communications Equipment. The equipment that provides
the functions required to establish, maintain, and terminate a connection
and to perform signal conversion and coding required for communication
between data terminal equipment and data circuit. The DCE facilitates the
communications of the data from its source to its destination and may or
may not be an integral part of a computer. Your PatrionPlus controller is
configured as DCE.
Driver
— The transmitter of a binary digital signal.
DSR
— Data Set Ready
DTE
— Data Terminal Equipment. The equipment comprising the data
source, the data sink, or both. Equipment usually comprising these
functional units—control logic, buffer store, and one or more input or
output devices or computers. DTE may also contain error control,
synchronization, and station identification capability.
Essentially, the DTE represents the ultimate source and destination of the
data. Examples of DTEs are receive-only printers (data destination) and
CRT/keyboard data terminals (either data source or destination).
DTR
— Data Terminal Ready
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