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Tecomat TC600
TXV 138 08.02
14
4.4.1.2 Interface RS-485
Interface RS-485 ensures conversion of output signals of the TTL level
to level defined by the specification V.11 (X.27, EIA RS-485), and input sig-
nals according to V.11 to the TTL level. Parameters of symmetric binding
circuits of the RS-485 interface allow for multi-point connection of end de-
vices in the half-duplex mode. It is suitable for connection realised in me-
dium distance in an environment with higher level of electromagnetic distur-
bances.
For the communication, PLC's of the TC600 series use binding circuits of
signals TxD (Transmit Data), RxD (Receive Data). Signal RTS (Request To
Send) is used internally for control of the transmitter activation.
Transmission speed
max. 230.4 kBd
1)
Cable length
max. 1200 m
2)
Sensitivity of differential inputs
RxD+, RxD-
±200 mV
Input resistance of differential inputs
RxD+, RxD-
min. 12 k
Voltage of differential inputs
RxD+, RxD- for level 1
min. 0.2 V
max. 12 V
Voltage of differential inputs
RxD+, RxD- for level 0
min. -0.2 V
max. -7 V
Voltage of differential outputs
TxD+, TxD- for level 1
min. 1.5 V (R
l
=75
max. 5 V
Io=0)
Voltage of differential outputs
TxD+, TxD- for level 0
min. -1.5 V (R
l
=75
max. -5 V
Io=0)
Difference of the output voltage
value for levels 0 and 1
max. ±0.2 V
Output current
max. ±250 mA
1)
The maximum transmission speed is limited by the maximum allowed
transmission speed of the set mode of the communication channel.
2)
The maximum cable length may only be used provided that the maxi-
mum transmission speed is reduced.
Interface RS-485 is
used for multi-point
connection
Parameters of the
RS-485 interface