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Brief description
APCIe-7xx0
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Transmission standards
The transmission standard of the respective serial interface depends on the fitted SI module.
Table 2-2: Plug-in modules and their transmission standards
Plug-in
module
Transmission
standard
Maximum
Baud rate
Optical
isolation
Interface
setting
Distance
between
transmitter
and receiver
SI232
-
SI232-G
RS232 1
MBaud
1 kV
- 30
m
SI422
-
SI422-G
SI422-PEP
(RTS/CTS
as RS422)
RS422 1
MBaud
1 kV
- 1.2
km
SI485
-
Automatic
transmitter
control
SI485-G
RS485 1
MBaud
1 kV
Automatic
transmitter
control
1.2 km
SITTY
TTY (20 mA
current loop)
19.2 kBaud
1 kV
Standby current
on transmit and
receive channel
1 km
If the
APCIe-7xx0
board is operated at the same time with modules that are optically isolated and
modules that are not optically isolated, the creeping distance of 3.2 mm applies only for the modules
that are optically isolated.
1 Plug-in module
SIxxx-G:
The -G suffix stands for optical isolation. The
SITTY
module is always optically isolated.
2 The indicated maximum lengths apply to normal interface cables (shielded control lead, 0.14 mm²). The length is also limited
by the number of users, line capacity, impedance and transfer rate.