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27
SERIAL
INTERFACE
AND
USB
The HD3405.2 is fitted with an electrically isolated RS-232C and USB2.0 serial interface
.
The USB connection requires the previous installation of a driver in the instrument software. Install
the driver
before connecting the USB cable to the PC
(please see the details on page 31).
The instrument standard serial transmission parameters 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 "
Baudrate
" parameter in the
menu (please see page 9). The possible values are: 38400, 19200, 9600, 4800, 2400, 1200. The
other transmission parameters are fixed.
The USB 2.0 connection does not require the setting of parameters.
The instruments are provided with a complete set of commands and data queries to be sent via the
PC.
All the commands transferred to the instrument must have the following structure:
XYcr
where:
XY
is the command code and
cr
is the Carriage Return (ASCII 0D)
Command
Response
Description
P0
&
Ping (locks the instrument keyboard for 70 seconds)
P1
&
Unlocks the instrument keyboard
S0
AT 21.3 6.778
Captured measurements (24 characters) AT = automatic temperature
compensation, temperature, pH or mV.
G0
Model HD3405 -2
Instrument model
G1
M=pH / Thermometer
Model description
G2
SN=12345678
Instrument serial number
G3 Firm.Ver.=01-01
Firmware
version
G4 Firm.Date=2004/06/15 Firmware
date
G5
cal 0000/00/00 00:00:00
Calibration date and time
G6 Probe=SICRAM
Pt100 Type
of probe connected to input
G7
Probe SN=11119999
Probe serial number
G8
Probe cal.=2004/01/12
Probe calibration date
GB
User ID=0000000000000000
User code (set with T2xxxxxxxxxxxxxxxx)
GC
Print instrument's heading
K1
PRINTOUT IMMEDIATE
MODE
Immediate printing of data
K0
Stop
printing
data
K4
&
Start logging data
K5
&
Stop logging data
K7 &
Enable
REL
function
K6
&
Disable REL function
KP &
Auto-power-off
function=ENABLE
KQ &
Auto-power-off
function=DISABLE
LN
&1999
Number of free pages in the flash memory
LD
PRINTOUT OF LOG
Print data logged in flash
