Sutron Corporation Satlink Operations & Maintenance Manual, Rev 8.04.2 11/3/2016 pg. 104
:BL 11.99 N45o27'28.47"W122o43'59.08" :NAME Small Creek :AMPTEMP
25.53C :PWR 1.6/0.0 :YD 172100 :SN 00001 :GOOD/BAD 19350/2
For append option details in other formats, please take a look at section
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10.2.8.
Advanced Options
10.2.8.1.
Circular Buffers
Circular buffers is an advanced option that is only useful if you have varying amounts of data to
transmit. Please consult the factory before trying to use it. If Circular buffer is enabled, Satlink
Logger will transmit only a portion of its data every time, and keep the rest for the next
transmission. If a number of bytes to be transmitted is specified (“Bytes to Tx at a time”), then
Satlink Logger will transmit only that many bytes, and leave the rest of the data in the buffer for
the next transmission. If “Transmit all data that can fit” is selected, then Satlink Logger will
transmit all the data that can fit into the transmission. (All transmissions are time limited).
If Circular Buffers are not enabled, Satlink Logger will throw away any data it cannot fit into the
transmission.
10.2.8.2.
Dumb Logger mode
The “Dumb Logger” mode is used to have Satlink transmit data from a logger that does not speak
the Satlink serial port communications protocol. If this mode is enabled, any data coming into
the serial port that is not of Satlink protocol gets put into the scheduled transmission buffer.
In order for Satlink to accept data from another logger, besides having the dumb logger mode
enabled, the user must ensure that the logger talk at 9600 bps, 8 data bits, no parity, one stop
bit, no flow control. There are two ways to wake Satlink up: either assert RTS or send a wake up
character. That wake up character should be binary 0. After waking Satlink make sure to wait at
least 6 milliseconds. After Satlink is woken, it will acknowledge by asserting CTS. If woken with a
character, Satlink will stay awake for five seconds after the last character comes in. If woken
with an RTS, Satlink will stay awake for as long as RTS is asserted. Note that you are likely to
need a null modem in order to connect a logger to Satlink.
10.3.
Random Transmissions
TX2 setup is reserved for the Random Environmental Satellite transmissions. Random
transmissions are generally used to notify the customer of alarm conditions.
Unlike scheduled transmissions, random transmissions do not get assigned a time slot. Multiple
stations are allowed to transmit on the same channel. That being said, the agency governing the
satellite provides appropriate settings for random transmissions including the channel.
These transmissions are called random because the transmission time is randomized. The
randomization is done in order to mitigate potential collisions with other transmitters on the
same channel. In addition to transmitting at a randomized time, more than one transmission is
sent to increase the chances of successful data delivery. The multiple transmissions are referred
to as a
burst
.
Random transmissions are generally initiated when the system goes into alarm. If random
transmissions are enabled, when Satlink goes into alarms, a burst of transmissions is fired soon
after the alarm. The exact time of the transmissions is randomized. The number of
