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Operating Instructions
6.9.5. Setting the COM Port Communication Mode
Each of the analyzer's serial ports can be configured to operate in a number of
different modes, which are listed in the following table.
1
MODE
MODE ID
QUIET
COMPUTER
SECURITY
HESSEN
PROTOCOL
E, 7, 1
RS-485
MULTIDROP
PROTOCOL
ENABLE
MODEM
ERROR
2
CHECKING
XON/XOFF
2
HANDSHAKE
HARDWARE
HANDSHAKE
HARDWARE
2
FIFO
COMMAND
PROMPT
1
Modes are listed in the order in which they appear in the
SETUP à MORE à COMM à COM[1 OR 2] à MODE menu
2
The default sting for these features is ON. Do not disable unless instructed to by Teledyne Instruments
Customer Service personnel.
120
Table 6-16: COMM Port Communication Modes
Quiet mode suppresses any feedback from the analyzer (iDAS reports, and
warning messages) to the remote device and is typically used when the
1
port is communicating with a computer program such as APICOM. Such
feedback is still available but a command must be issued to receive them.
Computer mode inhibits echoing of typed characters and is used when the
2
port is communicating with a computer program, such as APICOM.
When enabled, the serial port requires a password before it will respond.
4
The only command that is active is the help screen (? CR).
The Hessen communications protocol is used in some European countries.
16
Teledyne Instruments part number 02252 contains more information on
this protocol.
When turned on this mode switches the COMM port settings
2048
Configures the COM2 Port for RS-485 communication. RS-485 mode has
1024
precedence over multidrop mode if both are enabled.
Multidrop protocol allows a multi-instrument configuration on a single
32
communications channel. Multidrop requires the use of instrument IDs.
Enables to send a modem initialization string at power-up. Asserts certain
64
lines in the RS-232 port to enable the modem to communicate.
Fixes certain types of parity errors at certain Hessen protocol installations.
128
Disables XON/XOFF data flow control also known as software handshaking.
256
Enables CTS/RTS style hardwired transmission handshaking. This style of
data transmission handshaking is commonly used with modems or
8
terminal emulation protocols as well as by Teledyne Instrument's APICOM
software.
Improves data transfer rate when on of the COMM ports.
512
Enables a command prompt when in terminal mode.
4096
DESCRIPTION
from
No parity; 8 data bits; 1 stop bit
to
Even parity; 7 data bits; 1 stop bit
Model 400E Ozone Analyzer
Instruction Manual
P/N 04316 Rev: B
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