Lcd Backlight; Data Transfer To Pc - Hanna Instruments HI 98140 Instruction Manual

LCD BACKLIGHT

The LCD can be illuminated to allow the user to see the readings even
in dark environments.
It can be enabled/disabled through the LIGHT
key and it is automatically disabled when batter-
ies are in low battery condition.
Two levels (low and high) of backlighting can be selected. Repeatedly
pressing the LIGHT key causes the lighting to cycle from off to low then
to high intensity.
Note: It is not possible to enable backlight in low battery condition;
the "Batt" indication will be displayed when trying to do so.
When the backlight is enabled and an external power supply
is connected to the instrument, the backlight is always on.

DATA TRANSFER TO PC

Press RANGE to set the meter to time or date mode and connect the
meter to a PC through the RS232C output (the connector is located
on the top of the meter). Use HI920011 (5 to 9-pin) connection
cable.
To stop communication, press RANGE to display pH or mV reading.
SPECIFICATIONS:
Isolated 8-bit data transmission
Baud Rate: 2400
Start bit: 1
Stop bit: 1
Parity bit: none
SENDING COMMANDS FROM PC
With any terminal programs it is possible to remotely control your pH
meter. Connect the meter to the PC through the HI920011 cable,
start the terminal program and set the communication options as
follows: 8, N, 1, no flow control.
To send a command to the pH meter the scheme is:
<command> <CR>
The computer sends the command expressed as a 3-character se-
quence and a CR character.
Note: All the terminal programs that support the ANSI escape
sequence, represent the CR character with the string '^M'.
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The commands available are as follows:
MOD - to request the firmware code of the meter.
GLP - to request the last calibration data.
The meter answers with the following order:
pH calibration status (0=not calibrated , 1=calibrated)
pH calibration date (ddmmyy)
pH calibration time (hhmm)
pH electrode offset
pH electrode slope
pH buffer 1
pH buffer 2
mV calibration status (HI98150 only;1
mV calibration date (ddmmyy; HI98150 only)
mV calibration time (hhmm; HI98150 only)
mV buffer 1 (HI98150 only)
mV buffer 2 (HI98150 only)
mV buffer 3 (HI98150 only)
If an item is not available (e.g. buf 3 in case of a two points
mV calibration) the character "N" will be received.
PAR - to request the setup parameters setting.
The meter answers with a 6-character string for each param-
eter.
LTB - to request the number of logged samples.
LOD - to request the logged data.
The meter answers with the following order:
status byte
date (ddmmyy)
time (hhmm)
pH reading (binary)
mV reading (binary; HI98150 only)
temperature reading (binary)
At the end of the logged data the checksum (2 complement)
is sent.
Note: The meter will send <CAN> if a corrupted or unknown
command is received.
These commands may be sent with either capital or small letters.
Invalid commands will be ignored. The characters sent by the pH
meter are always capital letters.
calibrated,0 not calibr.)
= =
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