T-1
Appendix T
Buffered Terminal Mode
Buffered Terminal Mode
is a serial on-line mode, not a portable mode. Using the
data prompts in Program #1, the TriCoder prompts the operator for input, writes
the data to the TriCoder RAM, and transmits the data upon request from the Host
computer using a
Polled with ACK/NAK
protocol.
Buffered Terminal Mode
is
designed for the user who has several multi-dropped 422 T53 TriCoders and wants
to collect data all day with periodic requests from the host to transmit the data.
This mode uses Program #1, Data File #1, and Table #1 only.
Configuring the TriCoder for Buffered Terminal Mode…
Before setting the Tricoder in
Buffered Terminal Mode
, you must
complete the following:
1. Upload any data file currently in the TriCoder.
2. Select
RS-422
as the
Computer Interface
on the TriCoder setup.
3. Specify
ID Characters
for each TriCoder in the string. ID characters
must be ASCII 96-127.
4. Set the
Baud Rate
,
Parity
,
Data Bits
,
Stop Bits
, and
EOF String
to
match what the host computer program expects.
5. Enter the program you intend to use as prompts in Program #1.
6. The 5Vpower supply
must
be plugged into the TriCoder.
Getting into Buffered Terminal Mode…
Once you have met all of the requirements, put the TriCoder in
Buffered
Terminal Mode
by scanning
Operation Mode
, then
6
on the
TriCoder
Setup Menu
. This automatically sets the TriCoder to prompt the operator
using Program #1 and use a variation of the
Polling with ACK/NAK
communication protocol. Upon entering
Buffered Terminal Mode
, if
Program #1 does not exist, or if there is a data file still in the TriCoder, the
TriCoder displays an error message then resets itself. It will display the
opening screen as though it was turned off then back on.
Operating in Buffered Terminal Mode
These are the steps the TriCoder goes through when operating in Buffered
Terminal Mode:
•
The TriCoder begins prompting the user according to the
prompts stored in Program #1. When the host polls the
TriCoder with its ID Character, the TriCoder suspends
prompting the operator and transmits the first stored data field
in the format of:
ID+ Data + CheckS Check Terminator
