968-038 Datasheet 968-038 | P4-P6

DGS-SO2 968-038

March 2017

PRODUCTION DATA information is current as of publication date.

Sensors standard warranty. Production processing does not

necessarily include testing of all parameters.

QUICK START – TERMINAL PROGRAM OPERATION

1. Download and install a terminal program, such as Tera Term.

2. Connect the DGS to the USB to UART Bridge via the adapter board.

3. Connect the USB to your computer

a. If device drivers are not automatically downloaded and installed, you can find device drivers

for your operating system by searching www.silabs.com for: “CP210x USB to UART Bridge

VCP Drivers”.

4. Determine the COM port that is associated with the module

a. On Windows operating systems, locate and open the Device Manager.

b. The DGS device should be listed under the heading, “Ports (COM & LPT)”, as “Silicon Labs

CP210x USB to UART Bridge (COMXX)”, where XX is the unique port number associated

with the device.

c. Make a note of the unique port number.

5. Open Tera Term and establish a serial connection with the module

a. In the “New Connection” window, select the “Serial” radio button.

b. In the drop down list, select the appropriate COM port, identified above, then Select “OK”.

c. On the Menu bar, select “Setup”, then “Serial port…” Use: USB to UART BRIDGE SETTINGS

 Voltage level: 3.3 V

 Baud: 9600

 Data bits: 8

 Stop bits: 1

 Parity: None

 Flow Control: None

d. Select “OK”

6. Start Continuous Measurement in Terminal Window

a. Type any key to TRIGGER a measurement that takes about 1 second.

b. Type ‘c’ (lower-case c, without quotation marks).

c. The terminal program then prompts for an interval time. Type any of the 4 choices (5, 10, 30,

or 60s) and then press “Enter” on your keyboard.

d. The format of the output is: SN [XXXXXXXXXXXX], PPB [0 : 999999], TEMP [-99 : 99], RH [0 :

99], RawSensor[ADCCount], TempDigital, RHDigital, Day [0 : 99], Hour [0 : 23], Minute [0 : 59],

Second [0 : 59]

e. Type ‘r’ or ‘R’ at any time to reset the module and stop the continuous data output stream.

7. Initial ZERO (Clean Air) Calibration

a. When first given power after a long period of unpowered storage, the sensor needs to

stabilize in clean air to its zero offset current.

b. WAIT at least 1 hour in clean air while ensuring USB port has not gone to sleep. Sampling in

continuous mode is one way to ensure this.

c. Wake with any character, then type uppercase Z in the terminal window followed by unlock

code 12345/r when prompted.

DGS-SO2 968-038

March 2017

PRODUCTION DATA information is current as of publication date.

Sensors standard warranty. Production processing does not

necessarily include testing of all parameters.

NORMAL SENSOR STARTUP FROM HAVING NO POWER APPLIED

The electrochemical sensor output has the normal startup profile pictured here. When powering the sensor,

its output will rapidly increase followed by a gradual decrease. Once this process is complete, the sensor

output will be the most accurate and stable. The time and magnitude of this response may vary depending

on the sensor type and the length of time the sensor has been unpowered.

For the best results, it is recommended that the module remains always on power. DGS module

automatically enters a low-power state between TRIGGER measurements keeping the sensor powered

on for highest accuracy.

DGS OPERATION

When the DGS is connected to V+ and GND: The module’s microprocessor will automatically configure

the sensor and circuit for operation, output a measurement, and then enter a low power stand-by mode.

While in stand-by mode, critical sensor circuitry remains active to ensure the highest accuracy for future

sensor measurements.

If the module is powered and in low-power stand-by mode: Any data (i.e. single key stroke) received on

the UART interface will TRIGGER a measurement that is transmitted via UART. Due to the high-accuracy

ADC sampling method, there is a 1 second delay between when the module receives a command and

when the module transmits a response. After this, the module will re-enter the low-power stand-by mode.

If the module receives a recognized command within 1-second of a TRIGGER: The command will be

executed. Refer to the Simple Command Library for more information on recognized commands.

NOTE: When entering commands via a script or software, allow for a small delay in between all

characters.

DGS-SO2 968-038

March 2017

PRODUCTION DATA information is current as of publication date.

Sensors standard warranty. Production processing does not

necessarily include testing of all parameters.

SIMPLE COMMAND LIBRARY

To execute one of the following commands, send the corresponding case-sensitive ASCII character via

UART, within 5-seconds of a TRIGGER key stroke (entering command twice works well)

NOTE: When entering commands via a script or software, allow for a small delay in between all

characters.

Lowercase c: CONTINUOUS data output

The user is prompted to enter a measurement period (5, 10, 30, or 60 seconds)

Press ‘r’ or ‘R’ to exit

NOTE: In this mode, the module does not enter low power stand-by between

measurements.

Uppercase Z: ZERO user calibration

The sensor calibration is recalculated such that the module output is 0 ppm. (Enter

“12345\r” or “12345” followed by a return character for unlock code)

Uppercase B: Barcode entry

Initial setup for sensor based on the barcode sticker on the back of the sensor (Enter

“12345\r” or “12345” followed by a return character for unlock code)

Uppercase S: Span user calibration

The sensor nA/PPM value is recalculated such that the module output is the same as the

entered value. (Enter “12345\r” or “12345” followed by a return character for unlock code)

Uppercase L: LMP91000 manual setting

Allows the user the manually set the LMP91000. Refer to the LMP91000 datasheet for

information on the settings. (Enter “12345\r” or “12345” followed by a return character for

unlock code)

Lowercase l: LMP910000 read

Reads out the settings on the LMP91000

Lowercase e: EEPROM readout

Stored module parameters are output for diagnostic purposes.

Example output on next page

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968-038

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