Vaisala HMP260 SERIES Manuel de service télécharger pdf (Page 99)

HMP260 SERIES

Appendix 3: RS 485/422 serial port module HMP260-U017en-1.5

POLL mode

If a transmitter has been set to POLL mode, it will respond only to commands

sent with its address:

send 22

RH= 24.4 %RH T= 29.1 'C

Addresses from 1 to 99 can be used. According to the RS 485/422 standard a

maximum of 32 devices can be connected on same bus, but the number can be

increased if the line length and/or baud rate is reduced.

More than one baud rate can be used on an RS 485 line. E.g. the host of the

line can use different baud rates with different devices (this makes it possible

to use the same address for several devices).

The line terminations must be dynamic; e.g. RC circuit is used instead of a

simple resistor termination. Each RS 485 module has a dynamic line

termination so it can be used at the end of a line.

RS 485 network settings

HMP260 settings single pair dual pair

Full duplex/half duplex HDX FDX

Echo on/off OFF ON

Terminal settings

Line feed after carriage

return

yes no

HDX/FDX FDX FDX

When terminal is set to general <lf> (line feed) after <cr> (carriage return),

the listings will have two line feeds where also the HMP260 transmitters send

line feed.

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 117 118

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Vaisala HMP260 SERIES Manuel de service Page 99