Advantech PCL-740 Specifikace stáhnout pdf (Strana 15)

12 PCL-740 User's Manual

Jumper settings

Protocol Selection

First you have to decide which mode each port will be operating in,

RS-232, RS-422, RS-485 or current-loop driver mode. Select the

correct jumper configuration on jumper JP5.

¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡

Note: When either RS-232, RS-422 or RS-485 mode is selected, the

two current-loop Tx/Rx active/passive jumpers are inoperable.

Current-Loop jumpers (JP2,3,4)

Should you want to configure the PCL-740 to operate in the current-

loop mode, configure the main jumper for current-loop. You also

have to set Tx and Rx for active or passive mode. In the active mode

the Tx or Rx will generate the current required for data transfer over

the link. In the passive mode the current is generated by the card at

the other end of the link.

TxD RxD

¡ ¡ ¡ Active ¡ ¡ ¡ ¡

¡ ¡ ¡ ¡ ¡ ¡ ¡

¡ ¡ ¡ Passive

You may configure both the Tx and Rx to operate in the same mode,

or you can configure each Tx and Rx to operate in different modes.

Note: Whatever mode you select you must ensure that this is not the

same mode as the device that your PCL-740 is connected to. The

diagram on the next page shows a typical configuration.

RS-232

RS-422

RS-485

C.L.

RS-232

RS-422

RS-485

C.L.

RS-232

RS-422

RS-485

C.L.

RS-232

RS-422

RS-485

C.L.

RS-232 RS-422 RS-485 Current-Loop

RS-232

RS-422

RS-485

C.L.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 28 29

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