Red Lion GEMINI 33 - Manual (Page 23)

The timing diagrams show the timing considerations that need to be made.
RECEIVING DATA FROM THE GEMINI 3300
Data is transmitted from the Gemini 3300 when a “Transmit Value” or
“Transmit per Print Options” command is sent to the unit, or when the “PRINT
REQ.” terminal is activated. The Gemini 3300 can transmit 7 values: display
channels P, B and T, Presets 1 & 2, Batch Preset and Scale Factor. A list of the
abbreviations used when the Gemini 3300 transmits the values are shown below.
PRC - Process Count Value
BAT - Batch Count Value
TOT - Total Count Value
PS1 - Preset 1
PS2 - Preset 2
PSB - Batch Preset
SCF - Scale Factor
A typical transmission, with the “PR.ID” (Print ID) switch in the up
position, is shown below.
The first two digits transmitted are the unit address followed by two blank
spaces. If the unit address is 0, the first locations will be left blank. The next
three letters are the abbreviation for the mnemonic value followed by one
blank space. The actual values are transmitted last. Negative values are
indicated by a “-” sign. For positive values, the “+” sign is not transmitted.
Overflowed counter values are shown by an asterisk preceding the most
significant digit of the value. The decimal point position will “float” within
the data field depending on the actual value it represents.
For peripheral control purposes, a single line transmission will have a
attached to the end of the above string. For a “T” command or each line
of a block transmission, only the above character string is sent. For the last
line of a block transmission, a is attached to the end of the
above character string. An example of a typical serial transmission:
3 BAT 1234.56
If the “Print Request” terminal initiates the transmission, a 400 msec delay
is inserted before the transmission to keep multiple transmissions from
overrunning the printer.
When the Print ID switch is in the down position, the unit will not transmit
the characters before the data value (address, Value ID, spaces) or the 400
msec printer delay. The same above value when transmitted with the “PR.ID”
switch in the down position, is transmitted as:
1234.56
Note: When using the Gemini with a printer, with the “Print ID” switch in the
down position, some printers may not work, since the printer delay is not
transmitted.
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FIG. 2: TIMING FOR SENDING COMMANDS
(**) This is the time that it takes the Gemini 3300 to process the preset.
It varies with the Count Rate and Scale Factor Value.
FIG. 3: TRANSMIT COMMAND TIMING