turck BL20 Series - 12.4.3 Technical data

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12.4.3 Technical data
Fig. 282: Block diagram RS422
Fig. 283: Block diagram RS485
Technical data
Designation BL20-1RS485/422
Number of RS485/422 interfaces 1
Nominal voltage from supply terminal 18…30 VDC
Nominal current from supply terminal (field) I
L
25 mA
Voltage from module bus 4.75…5.25 VDC
Nominal current consumption from 5 VDC (module
bus) I
MB
60 mA
module
bus
interface
module bus
DC
DC
micro
controller
RS485/422
interface
RxD+
RxD-
TxD+
TxD-
GND
FE
SHLD
field supply
TxD+/RxD
TxD-/RxD-
GND
SHLD
module
bus
interface
DC
DC
micro
controller
RS485/422
interface
f