MorphoWave
TM
OEM
– Installation guide
Section 3 :Installation Procedure
56
IDEMIA
D
OCUMENT
–
R
EPRODUCTION AND
D
ISCLOSURE
F
ORBIDDEN
2015_2000009096 V6
January 2019
RS485
Figure 33: Serial port wiring – RS485 (Initial version)
A
5
Digital ground
Ground (connect pin 5 or 6)
6
Digital ground
Ground (connect pin 5 or 6)
D
5
RS485 TX / RX +
Out
RS485 non inverting signal
6
RS485 TX / RX -
Out
RS485 inverting signal
Figure 34: Serial port wiring – RS485 (Revision 2)
19 Black / Red
Digital ground
Ground
16 Green / Black
RS485 TX / RX +
Out
RS485 non inverting signal
18 Green / White
RS485 TX / RX -
Out
RS485 inverting signal
RS485 implementation is limited to half-duplex communication. So only Tx+, Tx- and
ground reference signals are necessary.
Depending on the RS485 network, an impedance adaptation may be required.
For farthest terminal, a 120-Ohms resistor termination may be added outside the
terminal between TX+ and TX-.
1
6
1
6
1
6
1
6
A
B
C
D
