SECTION 5
RS-232 INTERFACE
INTRODUCTION
Up to five RS-232 ports are available in the NDU. The RS-232 interface option supports both printers and video
terminals to annunciate alarm, supervisory, and trouble conditions.
M-232 PORT ACCESS LEVELS
The NDU interface panel, and each RS-232 Interface Port configured for a video terminal, are programmed to allow
certain operations at each access level. You must be “logged in” at the required access level or higher to perform
the various system operations. Up to 20 operators are allowed to log in at the various passcode access levels. The
number of operators, passcode access levels, and the allowed operations are programmed into the system
dependant on the customer requirements.
If a port is not configured to annunciate a class of events, such as supervisory conditions, you will not be able to
acknowledge those points with the video terminal keyboard, even though the video terminal is connected to that port,
regardless of the passcode level entered. Table 1 lists the default protection levels for the RS-232 interface. These
levels are programmed to meet customer requirements.
Table
1
RS-232 Interface Default Protection Levels
EVENT
Alarm Silence
System Reset
Alarm Acknowledge
Trouble Acknowledge
Supervisory Acknowledge
Clear Historical Logs
Alarm
Trouble
DEFAULT
1
1
1
1
1
3
3
NOTE:
Access level from the RS-232 video terminal/keyboard port is separate from the interface panel access
level.
THE VIDEO TERMINAL
The video terminal, or CRT (for the Cathode Ray Iube video’display), provides annunciation and system control
from the CRT display keyboard. This allows you to use the CRT to control most of the functionality of the system.
The CRT allows you to perform the following procedures from its keyboard:
l
Log In
l
Log out
l
Acknowledge Condition Changes
l
Perform System Reset Procedures
l
View and print Historical Logs
l
View Current Abnormal Conditions
l
Perform Alarm Silence Procedures
l
Print TrueAlarmTM Reports.
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