Hanna Instruments HI 93542 - Manual (Page 8)

15 14
The average mode will calculate the average for a period of up to
24 hours. If a different mode is selected for that channel, the
average will no longer calculate and the value will be lost.
At the end of the 24 hour period, the "AVG" tag will blink to
indicate that sampling has stopped, and the displayed value is
the last average calculated.
If a probe is removed or over-range is reached while in average
mode, the display shows flashing dashes and blinking "AVG" tag.
The average value is lost and will not restore even if the condition
restores. To start the average cycle again, either press CLR or re-
enter the average mode.
• While in T1-T2 (not for HI 93551R), pressing DISP will switch
between 4 displays:
Note: Pressing T1/T2 to change the channel will not alter the
information chosen to be displayed for each channel (DISP).
For example, if T1 is in average mode, the average will continue
to be calculated even if the user press T1/T2 to see T2.
Note: Relative/average modes cannot be entered if dashes are shown
in the main portion of the LCD.
Note: The auto-off time is disabled whenever a channel is set to
average mode.
SERIAL PORT COMMUNICATION
(HI 93551R & HI 93552R only)
HI 93551R and HI 93552R feature an RS232 output for transfer-
ring measurement data (once every second for HI 93551R and once
every 2 seconds for HI 93552R) to devices provided with RS232 input
(PC or printer).
The communication protocol has been designed to transmit to the
receiving unit all the displayed information.
The communication is unidirectional (meter to receiving unit only) and
the transmissions consist in a 32-character ASCII string, compatible
with our optional HI 92000 software.
The 32-character data string is structured as follows:
Main portion of the LCD
• byte 0
probe type: K-thermocouple (k)
• bytes 1, 2 measurement channel: T1, T2, T1-T2 (Td)
• byte 3 measurement mode: Normal (blank), Relative (R),
Average (A), Average done (a)
• byte 4 operating mode: Hold (H), Memory recall (M)
• byte 5 blank character
• bytes 6-10 measurement: reading (XXX.X or blank XXXX),
over-range (OVRG blank), no data (blank ----)
• byte 11 temperature unit: C, F
• byte 12 blank character
Secondary LCD, left portion
• bytes 13, 14
info description: low temperature (Lo), T1 (T1)
• byte 15 blank character
• bytes 16-20 measurement: reading (XXX.X or blank XXXX),
over-range (5 blanks), no data (blank ----)
• byte 21 blank character
Secondary LCD, right portion
• bytes 22, 23
info description: high temperature (Hi), T2 (T2)
• byte 24 blank character
• bytes 25-29 measurement: reading (XXX.X or blank XXXX),
over-range (5 blanks), no data (blank ----)
• byte 30 <CR>
• byte 31 line feed