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Serial converter USB <--> RS485
(Foto)
User and Installation manual
Apice Building Automation
Pag. 2 USB4 User manual
Introduction
This serial converter from USB to RS485 is the ideal component to connect a PC to a RS485 network. In the
computer it must be installed the driver containing in the CD provided with the device. The device allows a
communication speed of 250 Kbaud and it is directly powered by USB socket of the PC.
RS485 is isolated toward PC, to protect against common mode noise.
Technical specifications
Technical specifications
Power supply From USB socket of PC
Speed Up to 250 Kbits/s
Isolation 2500 VRMS
Connection with PC Cable supplied
RS485 Connection Removable screw terminals: A, B and GND
LED PWR Signaling that the device is powered
LED TXEN Active Transmission: LED off
LED RX Reception in progress: LED on
LED TX Transmission in progress: LED on
Dimensions 60x70x30 mm
Case Black painted aluminium and ABS
Table 1 – Technical specifications
Cables
Use a twisted pair cables for the connection to RS485 terminals and an optional cable for GND.
Figure 1 – Rear panel
Internal dip switch
The converter has 4 internal dip switch (unscrew the screws of rear panel and remove the board from the
container guides).
Figure 2 – Internal Dip Switch
Apice Building Automation
User Manual USB4 Pag. 3
Dip Switch (JP1) configuration
Switch
Descrizione Default
1 Termination resistence (120 Ohm) ON
2 Not used Not used
3 B with pull-up ON
4 A with pull-down ON
Table 2 – Dip Switch Configuration
Reception mode
The reception mode can be configured with jumper J2. Mode A: To pass automatically in reception after
transmission. Mode F: To remain in reception during transmission (to receive ECHO of the transmission packet).
Figure 3 – Reception mode
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