Campbell TGT1, Operator'S Manual

Page: 30 / 64

TGT1 GOES Transmitter
20
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 example program will execute P123 only after the program has been
compiled or when power is turned on. 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.