SYSTEM TECHNICAL MANUAL
HARDWARE DESCRIPTION
• The printer
• The peripheral adapter
• The NCR DECISION MATE V software
Even when these three parts of the system appear to be com
patible, it may be that the system does not function correctly.
The following information should help in resolving some of the
problems that may be encountered.
The operating system software used by the NCR DECISION
MATE V (CP/M and MS-DOS) supports the X On - X Off proto
col. The CONFIG utility in these operating systems allows for:
• Number of bits
• Parity selection
• Number of start/stop bits
• Baud rate
These must be set to match the settings in the printer exactly.
It is possible that many printers do not meet these requirements
except at certain baud rates and when they are in the “full-duplex”
mode.
The NCR versions of CP/M and MS-DOS do not support the
ETX/ACK protocol.
The kit K212 is designed to match the X On — X Off protocol
and expects the printer to provide ON signals (+12V, space) at:
• Pin 20, Data Terminal Ready (DTR)
• Pin 4, Request to Send (RTS)
PRINTERS NOT SUPPORTING X O N - X OFF
If a printer does not send control data back to the computer,
then control is achieved by a control line controlling the printer
buffer. This line does not have a standard pin assignment, and may
be connected to many different pins (e.g. 2, 4, 11, 13, 19, 20).
Check the printer documentation to determine which pin is used.
Kit K212 is prepared for control by pin 4, Request To Send
(RTS). See Figure 2.49.
Figure 2.49 Printer control
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