Port; Table 3-3: Rs-232 Signals; Table 3-4: Commands Via Rs-232 Input - Teledyne 3000TB Operating Instructions Manual

Installation
3.3.8 RS-232 Port
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 3-3.

Table 3-3: RS-232 Signals

RS-232 Sig
DCD
RD
TD
DTR
COM
DSR
RTS
CTS
RI
The data sent is status information, in digital form, updated every
two seconds. Status is reported in the following order:
The concentration in ppm or percent

The range in use (HI, MED, LO)

The span of the range (0-100 ppm, etc)

Which alarms—if any—are disabled (AL–x DISABLED)

Which alarms—if any—are tripped (AL–x ON).

Three input functions using RS-232 have been implemented to
date. They are described in Table 3-4.

Table 3-4: 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 3000TB
implementation.
Teledyne Analytical Instruments
RS-232 Pin
1
2
3
4
5
6
7
8
9
Description
Immediately starts an autospan.
Immediately starts an autozero.
Toggling input. Stops/Starts any status
message output from the RS-232, until
st<enter> is sent again.
Model 3000TB
Purpose
Data Carrier Detect
Received Data
Transmitted Data
Data Terminal Ready
Common
Data Set Ready
Request to Send
Clear to Send
Ring Indicator
28