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Power RS232
The power supply of the connector is assured by the control lines [DTR] of the RS232 connection. The type of
connection is compatible with the OPTO-RS Duplex connector.
RS232 communication parameters
4800 baudrate, even parity, 7 data bits, 2 stop bits
RS232 connection
The USB Power connector allows a communication in half-duplex mode (not simultaneously transmission and
reception of data), thus the transmission of a chain of characters (transmission request and other retro- com-
mands).
Important : Only the «duplex» instruments are able to detect remote commands others then the transmission
request (<?>). When using a Power cable with a «simplex» instrument, all commands will be interpreted as a
transmission request.
Connection
Line definition
Positive power supply :
Negative power supply (0V supply) :
Data (instrument to peripheral unit)
Data request:
Note : In case of a data transmission issued from the instrument, acknowledge the receipt by a new data request.
This enables the release of the HOLD mode of the instrument.
Specifications
Connection..............................................................
Power supply..........................................................
Data transmission parameters................................
Max. cable length....................................................
Number of transmissions per second.....................
Data transmission format........................................
Name
Sub-D 9 pin
DTR
4
GND
5
RXD
2
TXD
3
RS232 compatible, Dsub 9p female or open
from peripheral unit, with TXD, DTR and RTS lines
4800 bds, even parity, 7 data bits, 2 stop bits
15 m according to IEC standards
4-8/s (depends on the instrument connected)
[ Sign ¦ E1-En ¦ «.» ¦ F1-Fn ¦ CR ]
[ «ERR» ¦ Number ¦ CR ]
14
Cable color
Line status
white
ON (HIGH)
Shield
GND
yellow
INPUT
green
<?>+<CR>
E
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