INFICON Helium Leak Detector Modul1000 Interface description - Manual (Page 4)

1-2
Interface Connecting Cable
jin
s
80
e.f
m
Op
er
at
in
g M
a
nua
l
(1
01
1)
2 Interface Connecting Cable
The interface (RS232) is wired as data communication equipment (DCE). The
connection is made via a 9-way sub-D socket at the leak detector. The signals are
assigned as follows:
The other pins are not used.
The levels on the RS 232 interface are defined as follows:
RS232 Connecting Cable
A standard RS232 cable can be used (straight-through connecting cable, RxD and
TxD not crossed).
The RS232 hardware handshake must be switched off (in RS232 control program
written by the user).
If switching off of the hardware handshake is not possible, an RS232 connecting
cable wired as follows may also be used:
Pin Name Signal
2 RXD Receive data (Modul1000
→ PC)
3 TXD Transmit data (PC
→ Modul1000)
5 GND Reference ground
Level Low (L) High (H)
Voltage range -3V … - 25V 3V … 25V
Logic state logical 1 logical 0
Level designation Mark Space
Fig. 1-1 RS232 Connecting Cable