The model 205 is a research grade trace gas analyzer for ozone (O3). It supports analog voltage output and RS-232 bidirectional communication for configuration, diagnostics and improved data acquisition.
The rear RS-232 port is a male DB9 jack wired as Data Terminal Equipment (DTE):
| Pin # | Signal | CR6 terminal |
|---|---|---|
| 3 | data receive (input) | U5 |
| 2 | data transmit (output) | U6 |
| 5 | signal ref/ground | ⏚ |
To use with the example program, the model 205 must satisfy the following configuration:
- Baud rate of 19200: Cfg→I/O→Bdr→19200
- Temperature units of Celsius: Cfg→Unt→T→C
- Pressure units of millibars: Cfg→Unt→P→mbar
- (recommended optional) fast reporting rate: Avg→2s