Teledyne 3350 - Microprocessor based control room monitor for personnel safety - Manual (Page 22)

3 Installation Model 3350
3-6
Teledyne Analytical Instruments
3.5.3 Analog Outputs
There are four DC output signal connectors with screw terminals on the
panel. Recommended wire: 22 AWG minimum with 300VAC insulation.
There are two wires per output with the polarity noted. The outputs are:
0–10 V % Range: Voltage rises with increasing oxygen concentration,
from 0 V at 0 percent oxygen to 10 V at full scale
percent oxygen. (Full scale = 25% O
2
).
0–10 V Range ID: 03.33 V = Low Range, 06.66 V = High Range,
10 V = Air Cal Range.
4–20 mA % Range: Current increases with increasing oxygen concentra-
tion, from 4 mA at 0 percent oxygen to 20 mA at full
scale percent oxygen. (Full scale = 25% O
2
).
Audible Alarm: Factory installed to internal buzzer, may be used for
customer interconnection to 12V a Buzzer (12-
15VDC, 4.3mA Max.).
The RS232 terminals must not be connected to
any AC line source, or any source of hazardous
voltage.
3.5.4 RS-232 Port (Optional)
The digital signal output is a standard RS-232 serial communications
port used to connect the analyzer to a computer, terminal, or other digital
device. The pinouts are listed in Table 3-1.
Table 3-1: RS-232 Signals
RS-232 Sig RS-232 Pin Purpose
RD 2 Received Data
TD 3 Transmitted Data
COM 5 Common
The data sent is status information, in digital form, updated every two
seconds. Status is reported in the following order:
• The concentration in percent
• The range in use