Vaisala HMP260 SERIES Manuel de service télécharger pdf (Page 105)

HMP260 SERIES

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

3 NETWORK CONFIGURATION

Single loop operation

Bidirectional data on one pair and galvanic isolation are the advantages of the current

loop. Single pair/dual pair use is configured through wiring (see figure on page 3).

Supplying power from the same end to the loops prevents crossover voltages.

• Connect wires to the transmitter's serial connector.

• Check the wiring.

The following procedure must be repeated with all transmitters.

• Open the transmitter cover.

• Pull out the digital current loop module, if it is already mounted.

• Set the serial port of the terminal to 4800 baud, even parity, seven data bits

and one stop bit, full duplex (4800 E 7 1 FDX).

• The serial settings of the transmitter must also be 4800 E 7 1 FDX and the

transmitter must be in STOP mode. If these factory settings have been

changed, they must be changed back. Connect the RS 232C port of the

terminal to connector X17 on the top of the main board and switch the power

on.

Single loop wiring

• Set the address of the transmitter; it can be any number between 1 and 99. In

this example the address is 22:

>addr 22

Address : 22

• Set the serial bus settings according to your network specifications. This setting

will become valid after next RESET or power off:

>seri 2400 e 7 1 h

2400 E 7 1 HDX

RX GND TX

X17

1 2 ... 100 101 102 103 104 105 106 107 108 109 110 ... 117 118

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Vaisala HMP260 SERIES Manuel de service Page 105