INFICON Ecotec E3000 Multigas-Sniffer-Leak Detector Interface description - Manual (Page 15)

3 RS-232 interface
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3 RS-232 interface
The Ecotec E3000 is equipped with a RS-232 interface which is located on the rear right
side of the instrument. This interface is of the DCE type (Data Communications
Equipment) and allows the connection of a PC for monitoring and data logging. The
connection is provided through a commercially available Sub-D plug.
The RS-232 protocol can be set to “ASCII”, “Diagnostics”, “Printer auto” or “Printer manual”.
The ASCII protocol is a protocol similar to the SCPI, a standard protocol widely used for
measuring equipment. The Diagnostics protocol is a binary protocol used for analysis in
quality control and trouble shooting during manufacturing and service.
3.1 Connecting the RS-232 interface
A standard RS-232 cable can be used (straight-through connecting cable, RxD and TxD not
crossed). The RS-232 hardware handshake must be switched off (in RS-232 control
program written by the user). If switching off of the hardware handshake is not possible,
an RS-232 connecting cable wired as follows may also be used:
Fig. 6: RS-232 cable
The levels on the RS-232 interface are defined as follows.
Table 8: RS-232 Pin assignment
Pin Name Signal
2 RXD Receive data (Ecotec E3000
 PC)
3 TXD Transmit data (PC
 Ecotec E3000)
5 GND Reference ground
Table 9: RS-232 Level definition
Level Low (L) High (H)
Voltage range -3 V … - 25 V 3 V … 25 V
Logic state logical 1 logical 0
Level designation Mark Space