Vaisala HMP240 - Manual (Page 108)

HMP240
Appendix 3: Digital current loop module
M210300en
106
• 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 returned. Connect the RS 232C port of
the terminal to connector X17 on the top of the main board and switch
the power on.
RX GND TX
X17
Dual loop wiring
• Set the address of the transmitter; you can choose 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 system. This setting will
become valid after next RESET or power off:
>seri 2400 e 7 1 f
2400 E 7 1 FDX
• Switch echo on:
>echo on
ECHO : ON
>
• Change the serial output mode into POLL:
>smode poll
Serial mode : POLL
NOTE 1
The SMODE command must be given last.
NOTE 2
The transmitter outputs no prompt (>) after the SMODE
POLL command and it only reacts to commands which
include its address.
• Check that the transmitter responds to its address: