Hanna Instruments pH 300, Instruction Manual, Page: 48 / 57

95 94
For pH 300:
Commands not requiring an answer from
the pH meter:
PHR sets the range to pH
MVR sets the range to mV
CAL is equivalent to pressing the CAL key
CON is equivalent to pressing the CFM key
UPC is equivalent to pressing the
↑
°C key
DWC is equivalent to pressing the
↓
°C key
MEM is equivalent to pressing the MEM key
MRR is equivalent to pressing the MR key
COM is equivalent to pressing the COMM key
Commands requiring an answer:
pH? Causes the meter to send the pH value.
If the reading is out of range "Err 1" is
sent.
MV? Causes the meter to send the mV value.
If the reading is out of range "Err 2" is
sent.
TM? Causes the meter to send the tempera-
ture value. If the reading is out of range
"Err 3" is sent.
FA? Requests the meter to send the calibra-
tion factor of pH. The order of data is
as follows:
1) Month, day and Year
(when the calibration was done)
E.g. "123195" for 31st of Dec. 95
2) Buffer used when the offset was done
E.g. "0701" for 7.01 pH
3) Offset in mV
E.g. "_00504" for 50.4 mV
"-00504" for 50.4 mV
4) Buffer used when slope was done
E.g. "0401" for 4.01 pH
5) Slope in mV
E.g. "000592" for 59.2 mV
6) Temperature
E.g. "_01199" for 119.9°C
"-00099" for -9.9°C
BAR Requests the meter to send the RS232
baud rate
Select a different com-
mand prefix (between 0
to 47 in decimal) by
pressing UP and DOWN.
Press COMM to confirm the set-
ting.
Procedure for pH 302:
See program #9 (page 79).
SENDING COMMANDS FROM PC
With terminal programs such as, for example,
Telix
® , Windows Terminal ® , it is possible to
remotely control your pH meter. Use
HI920010 cable to connect the meter to the
PC, start the terminal program and set the
communication options as follows: 8, N, 1,
no flow control.
Command Types
To send a command to the pH meter the
scheme is:
<DLE> < command> <CR>
This line makes the computer send a Data
Link Escape character, the command ex-
pressed as a number or a 3-character se-
quence) and a CR character.
Note: Windows Terminal
®
and all the other
terminal programs that support the
ANSI escape sequence, represent the
DLE character by the string '^P' and
the CR character by the string '^M'.
E.g. the line '^PPHR^M' sets the range
to pH.
°C
°C
COMM
TELIX
®
is registered Trademark of "Deltacomm"
Windows Terminal
®
are registered Trademark of "Microsoft Co."