Vaisala HMP260 - Manual (Page 105)

HMP260 SERIES
HMP260-U017en-1.5 Appendix 4: Digital current loop module
3 NETWORK CONFIGURAT ION
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