Installation Guide

MorphoAccess® VP MD – Installation Guide
Annex 1 : Finger Placement Recommendations
2019_200000XXXX-V0
IDEMIA DOCUMENT - REPRODUCTION AND DISCLOSURE PROHIBITED
44
December 2018
RS-485 port wiring
The following figure shows how to cable the wires of the RS-485 OUT port of the
terminal (RS-485 protocol). This is used, for instance, to connect the MorphoAccess®
VP MD terminal to an Access Control Panel (ACP).
Figure 20: RS-485 port wiring – RS485
15
Blue / Black
RS485_RX+/TX+ (A)
In/Out
RS485 Rx/Tx non inverting
signal
13
Blue / White
RS485_RX-/TX- (B)
In/Out
RS485 Rx/Tx inverting signal
17
Black / Red
RS485_GND
Ground
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-.