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Vaisala HMP228 User Manual

Page 93

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HMP228

M210282en-A

Appendix 4: RS 485/422 serial port module

87

5.

SPECIFICATIONS

Connections

Berg sockets

on the main board

screw terminals 0.5 mm² wires,
stranded wires recommended

Assembly

plug-in module

Board dimensions

40 x 28 mm

Operating mode
(single or dual pair wiring)

half duplex

Network:

network type

daisy chain

cable type

twisted pair

line length max.

1000 m (3000 ft)

number of devices

32 devices on line

data speed

9600 baud max. for HMP228
transmitters

operating mode

polling mode

common mode voltage range

±7 V

Operating temperature

-40...+60 °C

Storage temperature

-40...+70 °C