Dwyer HM35 User Manual
Page 14
Initialisation
Remarks
DTR
RTS
0
1
1
0
min. 50msec
ACT-220L/220L+ are programmed by toggling
the control lines RTS and DTR. These lines
may not be low at the same time during
operation. In this condition the ACT-
220L/220L+ goes in power down mode. If
DTR and RTS are low at the same time or in
an undefined condition, both lines must be set
high for at least 50 ms to leave the power
down mode.
Setting the baudrate
Remarks
RTS
DTR
min. 0.5usec
1
0
1
0
Before setting the baudrate the
ACT-220L/220L+ has to be initialised
according Initialisation. The baudrate is set
to 9600 bps according the opposite diagram.
A PC usually needs more than 0.5 us for an
I/O-Instruction.
Control commands
The control commands are largely defined by the Standard Commands for
Programmable Instruments (SCPI)
.
13