REGARD 8-Input 4-20 Module & 8-Channel Display Card (ATEX Version)
Issue 2. October 2011
7
Command mode
Introduction
All card settings, such as measurement range, zero, span, alarm levels, gas name and
alarm operation, are set using the commands available in command mode.
There are three levels of access in command mode, two of which require the entry of a
password:
•
Read
level, in which configuration settings can be read but not altered, and basic
testing done (no password needed);
•
Maintenance
level, which allows access to commands used during regular calibration
and maintenance (requires maintenance password);
•
Configuration
level, which allows access to all commands used to set up the card
(requires configuration password).
Refer to the Configuration section for a detailed description of Command mode and the
commands available.
Alarm inhibit
When a card is put into command mode gas alarms (A1 and A2) are inhibited: the relays
will remain in their current state and will not change state unless changed manually. Any
relay already in its alarm state when the card enters command mode will remain in that
state. The Inhibit LED lights and the Fault relay trips to indicate that alarms are inhibited.
You can manually change the state of the alarm relays while in command mode using
commands 14–4 (A1 relay), 14–5 (A2 relay) and 14–6 (Fault relay).
Locking cards in command mode
Cards exit command mode automatically if no buttons are pressed for 10 minutes. To
lock a card in command mode use command 60–0. Note that this command is not
available in read mode.
Master card
The Regard Master card provides common and/or voted alarm outputs and advanced
setup facilities. For more information refer to the
Regard Master Card Operating Manual.
Modbus gateway card
The Regard Modbus gateway interface card provides a Modbus interface for Regard
systems. For more information refer to the
Regard Modbus Gateway Card Operating
Manual.
Electromagnetic compatibility (EMC)
The Regard 8-input 4-20 module and display card have been tested for compliance with
the EMC Directive. Take the following steps to ensure compliance:
•
Installation must follow the instructions given in this manual.
•
Installation must also follow the Draeger document “
Guidelines for the construction
and installation of Regard systems to comply with the EMC Directive
” which is
available separately.
•
Observe instructions to use screened cable, where given
Instructions or precautions that are essential for electromagnetic compatibility are
identified by “
EMC!
” in the margin.
