The hardware
14
Wherever there are multiple 1902s, the software uses channel
numbers to identify which 1902 is being addressed. Up to
thirty-two channels can be set. In the 1902 Mk IV, channel
numbers 0 - 15 are set by a sixteen-way rotary switch, accessed
through a hole in the back panel. Using a 3mm flat-bladed
screwdriver, turn the switch clockwise to increment the channel
number. The stepping ‘feel’ is satisfactorily distinct. In position
0 (and 8) the screwdriver slot is vertical. The switch positions
are printed on the back panel (in hex) as a guide.
If you need to set channel numbers above 15, you must access a
switch inside the 1902. See sections on opening the 1902 on
page 47, and on the options switchpack on page 52. When the
switch ‘OPT 0’ is in the off position, the rotary switch selects
channels 16 - 31.
The 1902 communication settings, that is to say the com port
number and the channel number(s) of the 1902(s), are stored in
the Windows registry, in keeping with modern programming
practice. Formerly this information was stored in a system file
named CEDCOND.INI. These settings only affect
communication with the host computer; they have no bearing
on the function of the 1902, such as the amplifier gain, filter
response, etc. Consequently they need only be set once, unless
you want to rearrange your 1902s in relation to your computer.
Once you have used Try1902 to check that your 1902s are
working correctly (as described in Confidence check above) you
should use the Try1902 File menu
Set port and channels
command to save your settings. The command opens a dialog
box used to set the 1902 communications parameters. There are
three fields, as described below:
numbers and
communication
Setting the 1902
configuration
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