Omega Vehicle Security HHTFO - Manual (Page 20)

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“i” Returns general information regarding the instrument, as well as some parameters that have been
programmed previously in the thermometer (either by RS-232 commands or via the keypad):
Ex: Model: HHTFO101
Option: NB Channel: 1
Mode: Continuous Scanning Mode
Scanning rate: Fast
Serial: HHTFO111A
Internal Software: V1.21
Last Factory Calibration*: 05/02/04 (YY/MM/DD)
Unit
o
C
Keyboard Status: Unlock
Channel Zero Span Enabled Temperature offset*
1 xxx.x xxx.x Yes/No ±xxxx.x
*: Temperature differential that is a consequence of the “f” command.
“q” “q” allows for selecting the fast (q+) or the slow (q-) acquisition mode. This is equivalent to the Sampling
Rate selection that is available on the FOB100 keypad. In slow mode, the last 4 temperatures are averaged
before being displayed or sent to the RS-232 port; this provides a better reading at the expense of being
slower.
“t” or “t[i]” Returns the current temperature reading for channel # i. “---.-” is displayed if the specified
channel number is not currently enabled or when no valid temperature is available for the requested channel.
However, during the initial warm-up time, the error “Err1” is sent in response to the “t” command. For multi-
channel instruments, if the “t” command is received without parameter, the temperatures for all channels are
returned. All temperatures are returned in
o
C or
o
F unit, as specified by the “u” command.
Ex: “t4
E
“ will return the temperature for channel # 4.
“t
E
”, with the HHTFO101 thermometer, will return:
+24.3<CR>
*
The “t” command is also available in a special “ta” version, that can be useful for continuously and
automatically monitoring all enabled channels. This special mode is recommended when automatically
acquiring temperature readings with a suitable data-logging software, and can be activated by issuing the
“ta+” command, or deactivated with the “ta-“ command. Once activated, the following information is
automatically sent when the temperature on a channel has been acquired:
“C:I;T: ±xxx.x<CR>”
where i is the channel number, and xxx.x is the temperature reading (signed number).
“u[i]” Set units of measurements to either Celsius (i=c) or Fahrenheit (i=f). Note that this unit selection is the
same as the temperature unit selection made from the keypad (if the display option is installed).
Ex:
“uc
E
“, to select ºC (Celsius).
“y” The “y” command can be used to confirm the “signal strength” of a probe and/or its connection. It can be
used as a diagnostic tool to confirm the good operation of a probe and its patch cord (if applicable) connected
to a channel. The returned value can be between 0.3 to approximately 3.00; a higher value is better. A
minimum of 1.25 is required for a channel to return a temperature.
Ex:
“y
E
”, with the HHTFO101 thermometer, will return:
CH1: power:2.61, lamp attenuation: 250, CCD time: 50ms (fixed)<CR>
*: 0.3 to 1.1 indicates that no probe is detected for this channel.