Black Box IC525A-F, Руководство пользователя

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RS-232 TO RS-485 INTERFACE CONVERTER W/OPTO ISOLATION
S4 Setting
ON Constant Transmitter
OFF Transmitter is controlled by RTS or DTR
3.2 Jumpers
Jumper straps JP3 and JP4 control two-wire/four-wire
and half-duplex/full-duplex operation, respectively.
Table 3-3. Interface Card Strap Summary.
Strap Function ON OFF
JP3A 2-wire/4-wire mode 2-wire 4-wire*
JP3B 2-wire/4-wire mode 2-wire 4-wire*
JP4A half- or full- duplex Half-duplex Full-duplex*
JP4B Impedance 120 ohms 12K ohms*
(terminate) (unterminate)
*Default settings.