update info on using separate pyro batteries to encourage including a switch

[fw/altos] / doc / usage.inc

diff --git a/doc/usage.inc b/doc/usage.inc
index d010f398e76d926559dc5eb398217f074b0b88f3..68d08bad8690a821f8b5649f70d788e187383156 100644 (file)
--- a/doc/usage.inc
+++ b/doc/usage.inc
@@ -297,7 +297,8 @@
 
                To use a separate pyro battery, connect the negative pyro
                battery terminal to the flight computer ground terminal,
-               the positive battery terminal to the igniter and the other
+               the the switched positive battery terminal to the igniter 
+               and the other
                igniter lead to the negative pyro terminal on the flight
                computer. When the pyro channel fires, it will complete the
                circuit between the negative pyro terminal and the ground
@@ -305,6 +306,12 @@
                to hook this up for each flight computer will be found
                in the section below for that flight computer.
 
+               Note that you must include a switch in the positive lead of 
+               the pyro battery for safety, as the on-board power switch 
+               circuit on our product only controls current flow from the 
+               the primary or system battery!
+
+
        === Using a Different Kind of Battery
 
                EasyMini
@@ -323,3 +330,22 @@
                different kind of battery to any of these will destroy
                the board.
                endif::telemega,easymega,telemetrum[]
+
+       === Using Packet Link Mode
+
+               All AltusMetrum flight computers that have a radio can
+               communicate with the ground station software for
+               configuration and other operations using the Packet
+               Link mode. This uses radio communication instead of a
+               USB cable. To set this up, the ground station software
+               must be configured to the correct data rate, frequency
+               and callsign.
+
+               You can monitor Packet Link mode from TeleBT or
+               TeleDongle by watching the LEDs. Each time the device
+               transmits, the red LED will flash. When the link is
+               busy, or when the link is not working, the device will
+               transmit 10 times per second, so the LED will flash
+               rapidly. When the link is working and there is no data
+               to send, the link will flash once per second, and the
+               LED will flash more slowly.