CTD-N Technical Manual
P/N 95F-6000-00 (February 2017)
page 103
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
APPENDIX D:
CTD-N Commands
The Citadel CTD System can be connected to a PC using an RS-232 or RS-485 Cable (see
CTDPro and Selecting the CTD-N
Connecting the CTD-N to Your Computer
.). Commands are
sent to the system through a terminal window (such as TRDI’s BBTalk or CTDPro’s terminal win-
dow). The CTD-N commands are listed in Table 16.
CTD-N Operating Modes
The CTD-N always runs in one of three operating modes. Each command applies specifically to one
or more of these modes. The CTD-N can be placed into any operating mode by entering the appro-
priate command. The CTD-N operating modes are the following:
Run mode
is the normal operating mode in which data are acquired and stored. There are
three Run modes: Continuous, where data are acquired continuously; Interval, where data
are acquired at specified intervals for specified periods; and Delayed Start, where data ac-
quisition begins at a specified time and date in the future in Continuous or Interval mode.
The instrument normally powers up in Run mode.
Open mode
is used to update calibration and other operational parameters. While the in-
strument is in the OPEN mode all data collection functions are stopped. In this mode the
user can access all instrument configurations such as calibration constants and parameter
output/stored selections. All data requests in the OPEN mode will be responded to with an
"OPEN MODE" response.
Calibration mode
provides certain functions that are used when the instrument is cali-
brated.
Command Properties
All the CTD-N commands exhibit the following common properties:
•
A command is executed only after a carriage return <CR> or a line feed <LF> character
is received.
•
Additional characters received after a <CR> or <LF> character are ignored until the
command is executed.
•
Unless specified otherwise, a command can be entered in either upper or lower case let-
ters.
•
All displays are followed by a <CR> and a <LF> character at the end of each line.
•
A command is invalid if it is not recognized for the specific operating mode or if it is en-
tered incorrectly or incompletely.
•
If an entered command is invalid, the message "BAD COMMAND, TYPE ?+Enter" is
displayed. Typing “?,” and then pressing Enter, lists some common commands and their
descriptions.
