Teledyne 2020 - Explosion proof thermal conductivity analyzer - Manual (Page 28)

Teledyne Analytical Instruments
3 Installation Model 2020
3-10
Table 3-4: Commands via RS-232 Input
Command Description
as Immediately starts an autospan.
az Immediately starts an autozero.
rp Allows reprogramming of the
APPLICATION (gas use) and
ALGORITHM (linearization)
System functions.
st Toggling input. Stops/Starts any status message output
from the RS-232, until st is sent again.
rm1 Range manual 1
rm2 Range manual 2
rm3 Range manual 3
rm4 Range manual CAL
ra Range auto
Implementation: The RS-232 protocol allows some flexibility in its
implementation. Table 3-4 lists certain RS-232 values that are required by
the Model 2020 implementation.
Table 3-5: Required RS-232 Options
Parameter Setting
Baud 2400
Byte 8 bits
Parity none
Stop Bits 1
Message Interval 2 seconds
3.3.10 Remote Probe Connector
The 2020 is a single-chassis instrument, which has no Remote Probe
Unit. Instead, the Remote Probe connector is used as another method for
controlling external sample/zero/span gas valves. See Figure 3-6.