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84
SERIAL INTERFACE RS232C
The instrument is equipped with a standard serial interface RS-232C, galvanically insulated; the in-
strument is supplied with a null-modem cable having sub D 9-pole female connectors (code
9CPRS232
).
The following signals are available on the SUB D 9-pin male connector of the instrument:
Pin Signal
Description
2
RD
Datum received by the instrument
3
TD
Datum transmitted by the instrument
4
DTR
Data terminal ready
5
GND
Reference logic mass
7
RTS
Request transmission
Also available on request is a second serial cable (code
CPRS232 C
) with a sub D 9-pole female
connector and a sub D 25-pole female connector with commutator for inverting lines 2 and 3: this
cable must be used in PCs without a 25-pole serial output or for connection to a serial printer.
Note: the deflector on the 25-pole connector of CP RS232 C optional cable must be turned to
COMPUTER or PRINTER position, depending on the chosen connector (this may not be true on
some computers or printers).
The standard serial transmission parameters of the instrument are:
•
Baud rate 19200 baud
•
Parity None
•
N. bit 8
•
Stop bit 1
•
Protocol Xon / Xoff.
The data transmission velocity may be changed by adjusting the "
Baudrate
" parameter on the menu
– item "S
erial
" (
see p.22
). The possible baud rates are: 115200, 38400, 19200, 9600, 4800, 2400,
1200, 600, 300. The other transmission parameters are fixed.
The DO9847 is able to respond to numerous commands sent directly to it by means of the serial
port: as may be seen in the table below, these are requests for information on the type of instrument,
on the version and date of the firmware, and on the values detected, at the time of sending the
command, by the probes connected to the three input channels.
All the commands transmitted to the instrument must have the following structure:
XYcr
where
XY
constitutes the command code and
cr
Carriage Return (ASCII 0D).
Command
Response
Notes
AA
MULTIFUNCTION Data Logger
Type of instrument
AG
Vx Rx
Firmware Version
AH
issued dd/mm/yy
Firmware Date
AS
Serial Number
Serial Number of the instrument
AZ
Complete heading
Supply information about the instrument
and the connected modules.
FA Current
date
FB
Logging start date
FC
Logging Stop date
FD Calibration
date
K1
Print SCREEN
Serial Out
Æ
Screen command
K2
Print RCD+
Serial Out
Æ
RCD+ command
K3
Print ALL
Serial Out
Æ
ALL command