PiXtend eIO Hardware Manual
Property
Value
Comment
Type of interface
serial interface, symmetrical
(differential)
wired
half-duplex
Type of connection
Data bus / fieldbus
Standard
RS485 / EIA485
MODBUS
Meets the requirements of
„MODBUS over Serial Line“
specification V1.02
Minimum transmission rate
2,400 Baud
Maximum transmission rate
230,400 Baud
Maximum number of
participants on the bus
32
depending on:
- the nature, environment,
length and cross-section of
the cables used
- the software used
- the circuit technology of
other participants on the bus
Differential output voltage
min. 1.5 V
max. 8 V
with maximum load (27 Ω)
without load
Minimum differential input
voltage
0.2 V
input threshold voltage
Maximum voltages
-7 V .. +12 V
at A or B against GND
Short circuit protection
yes
short circuit against GND
Short circuit current
max. 250 mA
Overload protection
yes
thermal
EMV Surge-/Burst-/ESD-
Schutz
yes
TVS diode – bidirectional
Isolation
no
Status display
no
only indirectly via “COM”
LED
Bias network
(“line polarization”)
no
not available and is not
necessarily needed in the
network
Termination resistor
yes
120
Ω
, via DIP switch
7
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