Table of Contents
Advertisement
Installation
3.3.2.3 RS-232 P
The digital signal output is a standard, full duplex RS-232 serial com-
munications port used to connect the analyzer to a computer, terminal, or
other digital device. It requires a standard 9-pin D connector.
The output data is status information, in digital form, updated every
two seconds for Standard mode of serial communication (see section
4.3.11). Status is reported in the following order for Standard mode:
•
The concentration in % or percent
•
The range in use (HI, MED, LO)
•
The span of the range (0-100 %, etc.)
•
Which alarms—if any—are disabled (AL–x DISABLED)
•
Which alarms—if any—are tripped (AL–x ON).
Each status output is followed by a carriage return and line feed.
Three input functions using RS-232 have been implemented to
date. They are described in Table 3-5.
Table 3-5: Commands via RS-232 Input
Command
as<enter>
az<enter>
st<enter>
The RS-232 protocol allows some flexibility in its implementation.
Table 3-6 lists certain RS-232 values that are required by the 3000RS-P
implementation.
Table 3-6: Required RS-232 Options
Message Interval
Teledyne Analytical Instruments
ORT
Description
Immediately starts an auto span.
Immediately starts an auto zero.
Toggling input. Stops/Starts any status
message output from the RS-232, until
st<enter> is sent again.
Parameter
Setting
Baud
9600
Byte
8 bits
Parity
none
Stop Bits
1
2 seconds. When CRC opens
again, zero and span are done,
3000RS-P
30
Advertisement
Table of Contents
