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2 Installation Model 6600
2-8: Part I
Teledyne Analytical Instruments
RD 2 Received Data
TD 3 Transmitted Data
DTR 4 Data Terminal Ready
COM 5 Common
DSR 6 Data Set Ready
RTS 7 Request to Send
CTS 8 Clear to Send
RI 9 Ring Indicator
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 is use (HI< MED< LO)
• The span of the range 0-100%, etc)
• Which alarm - 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 2-4.
Table 2-4: Commands via RS-232 Input
Command Description
as<enter> Immediately starts an autospan.
az<enter> Immediately starts an autozero.
st<enter> Toggling input. Stops/Starts any status message output
from the RS-232, Until st<enter> is sent again.
The RS-232 protocol allows some flexibility in its implementation.
Table 2-5 lists certain RS-232 values that are required by the 6000B/6600.
Table 2-5: Required RS-232 Options
Parameter Setting
Baud 2400
Byte 8 bits
Parity none
Stop Bits 1
Message Interval 2 seconds