Siemens ISOLATED MULTI-DROP SG-6048-01 - Manual (Page 6)

2
Setting Up the Converter
Siemens Energy & Automation, Inc. 3
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Figure 2.4 Rear Panel
The BAUD thumbwheel switch selects the data rate for
communications. Set the data rate to be consistent with the
data rate for your system’s SEAbus communications
network.
Table 2.1 Tx Control Baud Settings
Dial Number Data Rate (bps)
1 1200
2 2400
3 4800
4 >9600
2.5.2 Operating in Manual Mode
Set the converter to manual mode since most Siemens
application software uses RTS to enable the Isolated Multi-
Drop converter’s transmitter. (If your software does not use
RTS to enable the transmitter, refer to your user’s manual for
more information.) When the Isolated Multi-Drop converter is
connected directly to a PC, the MAN/AUTO switch must be
set to MAN and the DCD/RTS switch must be set to RTS.
When the Isolated Multi-Drop converter is installed at a
remote location using short-haul modems, the MAN/AUTO
switch must be set to MAN and the DCD/RTS switch must
be set to DCD. Short-haul modems typically pass RTS
through on the DCD pin at the remote modem.
2.5.3 Operating in Automatic Mode
Set the converter to automatic mode if you use application
software that does not support hardware handshaking (that
is, DCD/RTS) or that communicates to a remote location via
a dial-up modem on a nondedicated telephone line. With
the MAN/AUTO switch set to AUTO, the converter’s
transmitter is enabled by the data signal transmitted from
the computer. To set up the Isolated Multi-Drop converter
for Automatic mode, the MAN/AUTO switch is set to AUTO,
and the BAUD thumbwheel switch is set to match the data
rate on the communications network.