Thommen HM35 Bedienungsanleitung Seite 47

Initialisation
DTR
RTS
min. 50msec
Setting the baudrate
DTR
RTS
min. 0.5usec
Control commands
The control commands are largely defined by the Standard Commands for
Programmable Instruments (SCPI).
Remarks
ACT-220L/220L+ are programmed by toggling
1
the control lines RTS and DTR. These lines
may not be low at the same time during
0
operation.
1
220L/220L+ goes in power down mode. If
DTR and RTS are low at the same time or in
0
an undefined condition, both lines must be set
high for at least 50 ms to leave the power
down mode.
Remarks
Before setting
1
ACT-220L/220L+
according Initialisation. The baudrate is set
0
to 9600 bps according the opposite diagram.
1
A PC usually needs more than 0.5 us for an
I/O-Instruction.
0
47
In this condition
the baudrate
has to
the ACT-
the
be initialised