Vaisala HMP260 SERIES Instrukcja Obsługi Pobierz pdf (Strona 103)

HMP260 SERIES

HMP260-U017en-1.5 Appendix 4: Digital current loop module

2 OPERATION

The HMP260 transmitters can either be given an address or operated without an

address. Both single and dual loop wiring with half duplex connection can be used. No

address is needed when only one HMP260 transmitter is used; when several

transmitters are connected to the same line, each transmitter must be given an address in

the initial configuration.

A current loop must get its operating voltage from the master or it can have its own

(floating) power supply capable of supplying 15...40 V and 20...30 mA. Unregulated

AC/DC adapter can be used, if the current is limited to 20 mA at least by a serial

resistor.

Note.The host computer can restrict the loop supply voltage that can be used; see

computer specifications.

The serial line structure is a serial interfaced chain (daisy chain). At one end of the serial

line there must be a HMP260 transmitter and at the other end a line master. A branch

line can be made with a junction box.

SINGLE LOOP WIRING

TWISTED PAIR WIRING

CURRENT

LIMIT

LOOP

SUPPLY

HOST COMPUTER

HMP 230 TYPE

TRANSMITTERS

1 TO N PIECES

DUAL LOOP WIRING

TWISTED PAIR WIRING

CURRENT

LIMIT

LOOP

SUPPLY

HOST COMPUTER

HMP 230 TYPE

TRANSMITTERS

1 TO N PIECES

NOTE : HALF DUPLEX DATA TRANSFER.

HMP 230 DOES NOT RECEIVE WHILE

TRANSMITTING VIA SERIAL PORT MODULE.

RX -

RX +

TX +

TX -

RX -

RX +

TX +

TX -

RX -

RX +

TX +

TX -

RX -

RX +

TX +

TX -

RX -

RX +

TX +

TX -

RX -

RX +

TX +

TX -

1 2 ... 98 99 100 101 102 103 104 105 106 107 108 ... 117 118

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