Vaisala HMP243 Guide de l'utilisateur télécharger pdf (Page 94)

HMP240

Appendix 2: RS 485/422 serial port module M210300en

1. INSTALLATION

Switch the transmitter off.

Resistors R2, R3 and R4 between connectors X4 and X5 in the component

board in the cover of the transmitter are removed with side-cutting pliers. The

module is plugged in connectors X4 and X5 on the main board of the HMP240

transmitter; connector X1 on the module board to connector X4 and connector

X2 to connector X5.

Ch1

Ch2

-- +

GND

RX HI

RS485/ 422

X1X2

Jumper ( ) selections for the

RS 485/422 serial bus module

Single pair

Dual pair

serial bus

module

Cut off the resistors R2, R3 and R4 on the main board.

New signal names for X6 screw terminal are on the module.

Follow the instructions on the module:

X1 to X4 and

X2 to X5 on the mother board

NOTE! If the transmitter is NOT at the end

of the bus OR the line has a dynamic line

termination, the resistors R3 and R6 have

to be removed!

Connect the data wires to screw terminal X6 on the main board. Switch the

power on.

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Vaisala HMP243 Guide de l'utilisateur Page 94