OZONE MONITOR BMT 932 Manual, Rev. 02/2021
18
All EMO-Relays are in the open position if no power is applied to the instrument. A relay con-
tact will only close if all channels with assigned alarms were sampled and concentrations were
found below thresholds.
Shielded cables should be used on all connectors. The shields should be connected to the ground
connector ( ) at the rear panel. For the physical connection of the wires to the spring cage
contacts a screw driver 0.4 x 2.0mm is provided in the accessories.
11.5 Serial Interface
The bidirectional isolated serial interface is used for communication with a PC or other automa-
tion components in an industrial environment. Software updates can also be performed over this
interface. A serial cable for connection to a PC is a standard accessory.
Connection:
Pin Function Description
2 TxD Data sent
3 RxD Data received
5 GND RS-232 ground
The data format used is eight bits, one stopbit, no parity (8N1). See page 27 for configuration of
the interface, page 29 for its usage.
12 Switching On the Instrument
After application of power the instrument will display the following:
Bootloader VX.XX
Checking Flash:
VX.XX denotes the software version of the Bootloader. The Bootloader is a small application
which is run first. It checks the contents of the main flash memory for integrity, which takes a
few seconds. The Bootloader is also responsible for updating the firmware via the serial interface
(see p. 18). In case no problems are found it releases control to the main application. The follow-
ing is displayed:
BMT 932 VX.XX
VX.XX denotes the software version of the main application. After this the concentration range
is displayed. If the instrument is cold or has not been used in a while,
Waiting for Lamp
could be displayed, which will be followed by an indication of the measurement range.
This display is followed by a warmup period, the duration of which is being determined by the
state of the lamp. During warmup the Error Relay is switched to error. All other relay contacts
are open. The analog outputs put out 1 V, 10 V and 20 mA respectively. The serial interface (see
page 29) puts out max. concentration and the code for the warmup-state. The time left for
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