Campbell Scientific DCP100 GOES Data Collection Platform - Manual (Page 21)

DCP100 DATA COLLECTION PLATFORM
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TABLE 9.2-1. P123 Parameter Descriptions
Parameter
Number Description
1 - 8 The NESDIS-assigned address.
Convert the letters in the address to
their decimal equivalent (Table 8.2-
2). Each digit of the address is
placed in one parameter.
09 NESDIS-assigned self-timed uplink
channel (see Appendix E channel/
frequency correlation). If not assigned
a self-timed channel, type in zeros.
10 NESDIS-assigned random uplink
channel (see Appendix E for
channel/ frequency correlation). If
not assigned a random channel,
type in zeros.
11 - 14 Self-timed transmission interval is
NESDIS-assigned and usually 3 or 4
hours. Parameter 11 is days, 12 is
hours, 13 is minutes, and 14 is seconds.
Note: This is a 24-hour format.
15 - 17 Random transmission interval (the
NESDIS-assigned time period that
the transmission is randomly
repeated). Parameter 15 is hours,
16 is minutes, and 17 is seconds.
18 - 20 Set the time of the initial self-timed
transmission (NESDIS-assigned).
Parameter 18 is hours, 19 is
minutes, and 20 is seconds. Note:
This is a 24-hour format.
21 Transmit window length is NESDIS-
assigned and usually 1 minute.
Type 0 for a 1 minute window or 1
for a 2 minute window.
22 Sets the preamble length. A long
preamble increases the time the
satellite can lock onto the signal but
reduces the time for transmitting
data. The random mode requires
the short preamble. For a long
preamble (7.3 seconds), type 4.
For a short preamble (0.98
seconds), type 0.
23 Selects the buffer or buffers used.
Type 1 to select only the self-timed
buffer, a 2 to select only the
random, and a 3 to select both
buffers. These buffers must match
Instruction P120 parameters (see
Section 9).
Program example using P123 instruction
This is not the only way to run P123. The
programming theory used in this example is as
follows. Using a P91 statement determine if
Flag x is low, if true set Flag x high and execute
P123. When the datalogger is powered up all
Flags are automatically set low. The datalogger
will detect that Flag 1 is low, set Flag 1 high,
and execute P123. If power is lost, P123 will
automatically be executed when power is
restored.
In this example the datalogger will configure the
TGT-1 transmitter to use the NESDIS assigned
address of “0104C186”, interval or self-timed
channel number 151, with a 1 minute window
every 4 hours. Preamble will be set to short.
The random channel is not used.
1: If Flag/Port (P91)
1: 21 Do if Flag 1 is Low
2: 30 Then Do
2: Do (P86)
1: 11 Set Flag 1 High
3: Automatic Setup of TGT1 (P123)
1: 0 Address
2: 1 Address
3: 0 Address
4: 4 Address
5: 12 Address
6: 1 Address
7: 8 Address
8: 6 Address
9: 151 Assigned Uplink Channel
10: 0 Random Uplink Channel
11: 0 Self-timed Interval Days
12: 4 Self-timed Interval Hours
13: 0 Self-timed Interval Minutes
14: 0 Self-timed Interval Seconds
15: 0 Random Interval Hours
16: 0 Random Interval Minutes
17: 0 Random Interval Seconds
18: 1 Initial Self-timed Hours
19: 33 Initial Self-timed Minutes
20: 0 Initial Self-timed Seconds
21: 0 One Minute Window
22: 0 Short Preamble
23: 1 Self-Timed Buffer
4: End (P95)