Yokogawa Low Concentration (ppm) Zirconia Oxygen Analyzer OX400 - Manual (Page 49)

<6. Operation and Parameters>
6-12
IM 11M10B01-01E
6.3 Communication
The OX400 has RS232 serial communication as standard. Oxygen concentration, alarm, and
error information are transmitted via this communication. The following shows the communication
specifications.
• Communication Specifications
Table 6.1 Communication Specifications
Item Description
Communication method One-way (transmission only), asynchronous
Data format ASCII
Baud rate 38400 bps
Data length 8-bit
Parity None
Stop bit 1-bit
Flow control None
• Data Logging Packet
A A A A . A A A , B B B , C C C C , D D D D CR
Data delimiter “,” Terminate code
Figure 6.15 Configuration of Data Logging Packet
When communication terminal sends “TS” command to the OX400, OX400 will feed back data
logging packet periodically (approx. 200 ms.) When you want to stop comm, send the stop command
“CR”. The content of the data logging packet has the following meanings.
Table 6.2 Content of Data
Data Content
AAAA.AAA Oxygen concentration value
BBB Unit
CCCC Error (hexadecimal display)
DDDD Alarm (hexadecimal display)
1) Oxygen concentration value
The oxygen concentration value is displayed in the AAAA.AAA format and up to the three
decimal places are output.
(Note) When the output smoothing is set, the smoothed value becomes an oxygen concentration
value.
2) Unit
The unit is displayed in the BBB format. The output character is “%” or “ppm.”
3) Error
The error is displayed in the CCCC format. The output characters are displayed in hexadecimal
format, and Table 6.3 shows the error factors and output characters.