
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 110
To define an output message in GOES Binary Format, each field of that
message must be GOES Binary Format (rather than Log Only, Time Stamp,
etc.) Field Type.
Use the Data Output menu to define each field in your message and to choose the GOES Binary Format
type.
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Fields of this type are transmitted but not logged.
The GOES Binary Format converts each data value into an integer, encodes it as a binary value, and then
breaks that binary-encoded data value into chunks of 6 bits. Each byte of data will contain one of these 6-
bit chunks as its 6 least significant bits. Bit #7 is always set to 1 to ensure that the resulting character is
printable. Bit #8 is a parity bit that will only be set to 1 if the there are an even number of bits set in the
lower 7 bits of the byte.
The following line items in the Data Output Menu are interpreted in a non-standard way for the GOES
Binary Format.
Field decimal places: The data value to be treated is multiplied by the appropriate number of factors
of 10 to bring the data value to an integer, while still retaining the requested accuracy. for example,
suppose you wish to output a measured temperature to 2 decimal places (e.g., 23.62 degrees). Line
item 5 should take the value 2. The value will be converted to 2362 before transmission.
Field width: Suppose that the field width is 3. The data value (2362) will be converted to a 36=18-
bit value, with the most significant bit being a sign bit. The binary version of this data value
becomes:
000000 100100 111010
The three 6-bit data fields would be calculated and transmitted as follows:
For output to any device other than the GOES radio, the two most significant pair of bits 01 precedes
each 6-bit chunk. This will give a printable ASCII string. The above values will be converted as
follows:
Hex values: <40><64><7A>
Characters: @dz
You will see @dz on the screen, if the output message is routed to a terminal.
For output to a GOES radio, the most significant bit of each byte will be replaced by a parity bit.
When you download the data from NOAA/NESDIS, the format is 7 data bits, 1 parity bit. Therefore,
the parity bit will be transparent; and you will therefore still see @dz.
6.8. ARGOS SATELLITE COMMUNICATION
The ZENO
®
-3200 data logger can transmit data through the ARGOS satellite system operated by the
Centre National d’Etudes Spatiales (CNES) ARGOS System on board two polar-orbiting, sun-
synchronous satellites operated by the National Oceanographic and Atmospheric Administration
(NOAA).
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Refer to Section 10.6.
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