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RS232 Interface - Remote Control
The RS232 parameter are:
N-8-2 (no parity bit, 8 data bits, 2 stop bits,
RTS/CTS hardware protocol).
Baud-Rate Setting
After the first POWER UP (switching on of the oscilloscope )
and the first command SPACE CR (20hex, 0Dhex) sent from
the PC, the baud rate is recognized and set automatically
between 110 baud and 115200 baud. The oscilloscope is then
switched over to REMOTE control mode. The oscilloscope
then transmits the RETURNCODE: 0 CR LF to the PC. In this
status all settings (with the exception of those functions
mentioned under "Controls and Readout") can be controlled
via the interface only.
The only ways to quit this status are:
• Switching the oscilloscope off,
transmitting the command
• RM= 0 from the PC to the oscilloscope, or
• depressing the AUTO SET ( LOCAL ) pushbutton,
if in unlocked condition (command LK=1... was not sent)
Front Panel HM1004-
34
/ HM1505-
3
3
After the remote state has been switched off the RM -LED (3)
is dark.
Please note:
A minimum time must elapse between the commands
RM=1... (remote on) and RM=0... (remote off) and vice
versa. The time can be calculated with the formula:
tmin = 2x(1/baud rate) + 60µs.
If at the beginning no SPACE CR command is recognizable,
the oscilloscope pulls the TxD line low for approx. 0.2ms and
causes a break on the PC.
Data Communication
After successfully being set to remote control mode, the
oscilloscope is prepared for command reception.
Subject to change without notice
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