Vision Systems VScom 200E PCIex Instrukcja Użytkownika Pobierz pdf (Strona 45)

6 OnRISC Hardware API

6.4.2. OMAP3 based Devices

Serial interfaces on OMAP3 devices use FTDI USB-to-serial converter chips (FT2232D). Both ports

appear in the system as /dev/ttyUSB0 and /dev/ttyUSB1. Two methods are provided to switch

between RS232/RS422/RS485 modes (termination inclusive): via software

and via DIP-switch.

Each port has its own DIP-switch named SW1 and SW2. Table 5 shows possible DIP-switch

settings.

S1 S2 S3 S4 Mode

oﬀ oﬀ x x RS-232 Loopback Test

on oﬀ x x RS-232 MODE

on on on oﬀ RS-422 MODE

on on on on RS-422 MODE RxD +/- with 120 ohm Term

on on oﬀ oﬀ RS-485 Full Duplex Mode

on on oﬀ on RS-485 Full Duplex Mode RxD +/- with 120 ohm Term

oﬀ on oﬀ oﬀ RS-485 Half Duplex Mode without Echo

oﬀ on oﬀ on RS-485 Half Duplex Mode without Echo RxD +/- with 120 ohm Term

Table 5: Serial Modes (hardware switching)

Refer to Section B.1 for software method.

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