Instructions

62
A frame consists of a set of information which can not be separated. When you print a current measurement,
this frame is equivalent to a line. For a measurement in MIN/MAX recording mode, it is three lines.
The transmission levels are set as follows:
- Level 1 = light present
- Level 0 = no light present
The transmission rate is 1200 bauds
The link-up format is set:
- 1 START bit/8 data bits/1 STOP bit/no parity
Transmission code: All the transmission characters are in ASCII code, except for the transmission of
rapid measurements which are transmitted in a specic format.
Transmission protocol: pseudo X ON / X OFF
The transmission is done on two optic bres:
- RxD Reception of data
- TxD Transmission of data
This interface allows the transmission of the results of the measurement, of the content of the program
memory, or measurement of the state of the instrument.
This transmission is obtained from a command, this may be local, directly from the instrument, or at a
distance, from an external control unit.
11. REMOTE DEAD
It is possible to establish a dialogue between the Fieldmeter and a computer equipped with a serial
type RS 232 interface. The operation of the interface is described in the chapter «DIGITAL OUTPUT».
This readout is sent to the instrument on the RxD input.
The readout consists of sending a special code to the instrument.
If the code transmitted does not correspond to a code known by the letter, the instrument sends the error
code 4 (ER 4) to the Tx ouput.
The output of the codes will start 100ms max after the last character applied to the RxD input.
As the digital link is not a true FULL DUPLEX, the control commands can not be sent simultaneously
with the emission of measurement parameters.