Remote-processing RPC-330 Manuel d'utilisateur télécharger pdf (Page 15)

SERIAL PORTS SECTION 4

Page 4-2 RPC-330

Figure 4-2 Network diagram

400 LINEB 5,0,(LINEB(5,0) .AND. 251)

500 LINEB 5,0,(LINEB(5,0) .OR. 4)

Jumper W4 determines if COM 1 receive is RS-232 or

RS-422/485.

W4[1-2] RS-485

W4[2-3] RS-232 (default)

COM1 default is RS-232. Use the CONFIG BAUD

statement to set the software to RS-422 or RS-485.

When set to RS-422, the transmitter is always on. RS-

485 mode turns on the transmitter only when sending.

RS-422/485 OPERATING INFORMATION

RS-422/485 Termination network

When the RPC-330 is the last physical unit on a network

(RS-485), or it is the only unit (RS-422), the receiver

must be ter minated to prevent r inging. Insert jum pers in

W5 and W6 to install the network terminator.

Only one slave device on a RS-485 network should have

a terminator installed. The host transmitter should also

have a 100 ohm resistor in series with a 0.1 mfd

capacitor. T he term inator on the RPC -330 includes p ull

up and pull down resistors to prevent lines from floating

and generating er roneous char acters.

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Remote-processing RPC-330 Manuel d'utilisateur Page 15