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<enter> Immediately starts an autospan.
az<enter> Immediately starts an autozero.
rp<enter> Allows reprogramming of the
APPLICATION (gas use) and
ALGORITHM (linearization)
System functions.
st<enter> Toggling input. Stops/Starts any status message output
from the RS-232, until st<enter> is sent again.
rm1<enter> Range manual 1
rm2<enter> Range manual 2
rm3<enter> Range manual 3
rm4<enter> Range manual CAL
ra<enter> 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.