Vaisala HMP228 User Manual
Page 99
HMP228
M210282en-A
Appendix 5: Digital current loop module
93
•
Set the transmitter in POLL mode:
>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:
send 22
aw= 0.244 T= 29.1 'C
•
Disconnect the terminal.
•
Remount the digital current loop module.
•
Close the cover.
•
When all transmitters on the network have been configured, switch
them off.
Dual loop operation
Single pair/dual pair use is configured through wiring (see figure on page 2).
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.
RX GND TX
X17