Vaisala HMP230 Manuel d'utilisateur télécharger pdf (Page 114)

HMP230 SERIES

Appendix 3: RS 485/422 serial port module M210225en-A

108

2. OPERATION

The HMP230 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 HMP230 transmitter is used;

when several transmitters are connected to the same line, each transmitter

must be given an address in the initial configuration.

A single transmitter can get its operating voltage from the master or it can

have its own (floating) power supply or it has the power supply module in

use.

The serial line structure is a parallel interfaced chain (daisy chain). At the

ends of the serial line there must be a HMP230 transmitter, dynamic line

adapter (120 ohm resistor in series with a 33 nF capacitor) or line master. If a

branch line is made with a junction box, the branch should be shorter than 3

meters.

When connecting the device, follow the instructions given in the figure in

Chapter 1.

TX H I

TX L O

TWISTED PAIR WIRING

HOST COMPUTER

DUAL LOOP WIRING

TWISTED PAIR WIRING

HOST COMPUTER

RX LO

RX HI

TX H I

TX LO

RX LO

RX HI

TX HI

TX LO

RX LO

RX HI

TX HI

TX LO

RX LO

RX HI

TX H I

TX LO

RX LO

RX HI

120R

33 nF

TX H I

TX L O

RX LO

RX HI

120R

33 nF

120R

33 nF

NOTE: DYNAMIC LINE TERMINATION

REQUIRED IF NO DEVICE

AT THE END OF THE BUS.

NOTE: DYNAMIC LINE TERMINATION

REQUIRED IF NO DEVICE

AT THE END OF THE BUS.

HMP230 type transmitters

1 to n pieces

HMP230 type transmitters

1 to n pieces

SINGLE LOOP WIRING

1 2 ... 109 110 111 112 113 114 115 116 117 118 119 ... 162 163

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Vaisala HMP230 Manuel d'utilisateur Page 114

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