Serial interface _____________________________________________________________________
Vaisala _________________________________________________________________________ 38
CHAPTER 8
SERIAL INTERFACE
WARNING
The serial interface
MUST NOT
be used in hazardous areas.
Use the serial interface for calibration and testing purposes in safe
areas only. Always use the serial interface cable (optional accessory,
order code: 25905ZZ). Connect one end of the cable to the serial port
of your computer and the other to the connector marked 'RS 232C' on
the transmitter's electronics unit (see Figure 3-2, item 9).
NOTE
With serial communication the current consumption increases
approximately to 7 mA and the transmitter is not able to operate with
4 mA. Therefore, it is recommended to use serial communication
only temporarily for changing settings or for calibrating the
transmitter in a safe area. With serial port, the minimum supply
voltage is 15 VDC.
NOTE
The transmitter incorporates a serial interface detector. However, not
all terminals or PC serial ports (e.g. opto-isolated or ports not
meeting RS232C standards) recognize this standard. If the
communication is not possible via a serial interface, use a forced
activation by pressing simultaneously buttons
▲
and
E
on the
transmitter cover. To deactivate the forced activation, press these
buttons again or reset the transmitter. If the transmitter does not
receive any commands for half an hour, it automatically closes the
serial communication.
Serial communication settings
T
ABLE
8-1
Serial communication settings
parameter
value
bauds
2400
parity
none
data bits
8
stop bits
1
