The notation <cr> refers to the carriage return control character, which you can send in a terminal application by pressing enter on your keyboard. Before entering commands, send a <cr> to clear the command buffer.
You can enter the commands in uppercase or lowercase. In the command examples, the keyboard input by the user is in bold type.
Table 1 lists the basic serial commands that are available by default. To access advanced serial commands (listed in Table 2), enter the command pass 1300.
| Command | Description |
|---|---|
| Device information and status | |
| ? | Show probe information. |
| ?? | Show probe information (will respond in POLL mode). |
| errs | Show currently active errors. |
| help | Show list of currently available serial commands. |
| snum | Show probe serial number. |
| system | Show probe firmware information. |
| time | Show probe operation hours and uptime. |
| vers | Show probe firmware version. |
| Serial line output and communication | |
| close | Close connection to probe (POLL mode) |
| form [modifier string] | Show or set output format. |
| intv [0 ... 255 s/min/h] | Set continuous output interval for R command. |
| open [address] | Open connection to probe in POLL mode. |
| r | Start the continuous outputting. |
| s | Stop the continuous outputting. |
| sdelay [1 ... 255] | Show or set serial line transmission delay (1 ... 255, 1 unit = 4 milliseconds) |
| send | Output a single measurement message. |
| seri [baud data stop parity] | Show or set the serial interface settings. |
| smode [mode] | Show or set startup serial mode: RUN, STOP, or POLL. |
| Environmental compensation | |
| env | Show or set environmental parameters. |
| Adjustment information | |
| adate | Show CO2 factory adjustment date. |
| atext | Show CO2 factory adjustment information. |
| Other commands | |
| reset | Reset the probe. |
| pass [1300] | Access advanced serial commands. |
| Command | Description |
|---|---|
| Serial line output and communication | |
| addr [0 … 254] | Show or set probe address. |
| Analog output | |
| amode | Show or set analog output mode (analog output limits and error level). |
| aover | Show or set analog output overrange and clipping behavior. |
| asel | Show or set analog output parameter and scaling. |
| Calibration and adjustment | |
| cco2 | Adjust CO2 measurement gain and offset. |
| cdate | Show or set calibration date. |
| ct | Adjust temperature measurement offset. |
| ctext | Show or set calibration information. |
| Environmental compensation | |
| o2cmode | Show or set oxygen compensation mode. |
| pcmode | Show or set pressure compensation mode. |
| rhcmode | Show or set humidity compensation mode. |
| tcmode | Show or set temperature compensation mode. |
| Other commands | |
| frestore | Restore probe to factory settings. |