Measuring voltages greater than +5V. As noted above, the A-to-D convert
-
ers associated with AN0 through AN3 convert analog voltages from 0 to +5 V
to digital values from 0 through 255. Thus, input voltages greater than +5 V
would all receive the same digital value, yielding little useful information.
However, it is possible to use AN0 through AN3 to measure (digitize and re
-
port) voltages as great as +50V (the maximum external voltage for the device)
by adding appropriate voltage dividers to scale the range of input voltages
down to fit within the range measured by the A-to-D converters. This is accom
-
plished by installing appropriately valued resistors in the blank resistor posi
-
tions provided on the PC board (i.e., positions labeled R4, R8, R3, and R13, for
AN0, AN1, AN2, and AN3, respectively).
• AN4, AN5, AN6, and AN7 (inputs 4-7) are connected to internal
circuitry and the readings have no significance to the user.
+ AN7 can be used to report the state of an external TTL (0 or 5 volt)
signal connected to pin 2 on the Radio port, as long as the user is
willing to give up the normal use of this pin, which is as an external
carrier detect input.
Kantronics recommends that users not cut lines associated with AN4 through
AN7 for adapting them for measuring additional A-to-D inputs.
+
Data can be gathered from a remote site by connecting to MYREMOTE and then
issuing the ANALOG command.
See also: myremote
ARQBBS {ON | OFF}
default OFF
When ON, the PBBS in your KAM’98 may be accessed by another station using
AMTOR,G-TOR, or Pactor ARQ. When OFF, the PBBS may only be accessed
on packet.
Command Reference KAM’98 Commands
User’s Guide 228 KAM’98 v 8.3
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