Delta OHM HD 98569, Manual

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Serial interface and USB
The instrument is provided with a multistandard serial port, electrically isolated, RS-232C and USB
2.0.
The USB connection requires the previous installation of a driver supplied with the instrument
software.
Install the driver before connecting the USB cable to the instrument
(please see the
details on page
46
).
Standard parameters of the instrument serial transmission are:
•
Baud rate 38400 baud
•
Parity None
•
N. bit 8
•
Stop bit 1
•
Protocol Xon/Xoff
It is possible to change the RS232C serial port baud rate by setting the "Baud Rate" parameter in
the menu (please see page
12
). The possible values are: 38400, 19200, 9600, 4800, 1200. The
other transmission parameters are fixed.
The USB 2.0 connection does not require the setting of parameters.
The selection of the port is
carried out directly by the instrument:
All the commands transferred to the instrument must have the following structure:
XXCR
where:
XX
is the command code and
CR
is the Carriage Return (ASCII 0D)
The XX command characters are exclusively upper case characters. Once a correct command is
entered, the instrument responds with "&"; when any wrong combination of characters is entered,
the instrument responds with "?".
The instrument response strings end with the sending of the CR (Carriage Return) and LF (Line
Feed) command, preceded by the “|” vertical bar character, that is, the combination “|CRLF”.
Before sending commands to the instrument via the serial port, locking the keyboard to avoid
functioning conflicts is recommended: Use the P0 command. When complete, restore the keyboard
with the P1 command.
Reading the instrument parameters
COMMAND ACTION RESPONSE NOTES
AA
Model request
HD 98569
pH/Chi/Oxy/temperature
AG
Firmware version Firmware 1.00.100
AH
Firmware date 2006_01_31
AS
Serial number Ser. Number=00000000
AU
User identification
User=FACTORY
User=Administrator
User=User_1
User=User_2
User=User_3
User=Anonymous
AZ
Full heading
HD 98569
Vers. 1.00.100
2007/04/24
Ser. number=00000000
Calibrated 2007-01-01 00:01:00
Operator=Admin
Communication
interface=USB
Temp. comp. mode=AUTO
T Probe = Pt100