18
20-740/745
RF MULTIPLEXER MODULE
pickering
3.3 General Programming Commands
ARESET a
Open all channels/crosspoints on device a
DELAY t
Force a minimum delay of t milliseconds between two instructions
RESET
Open all switches on all modules
VIEW? a
View status of device a
3.4 Configuration Specific Programming Commands
The multiplexer/matrix module may be configured in one of the following modes:-
3.4.1 Quad Multiplexer Mode (20-745 only)
Each module contains four 8 to 1 multiplexers, referred to as banks 1, 2, 3 and 4.
CHAN a,b,c
Select channel
c
on bank
b
of multiplexer
a
. Only one channel at a time is permitted to be on, automatic
break-before-make is always enforced.
b
is in the range 1 to 4.
e.g.
CHAN 12,4,7
will operate the module with address 12 selecting bank 4 channel 7.
CHAN 15,2,1
will operate the module with address 15 selecting bank 2 channel 1.
3.4.2 Dual Multiplexer Mode
Each module contains two 16 or 8 to 1 multiplexers, referred to as banks 1 and 2.
CHAN a,b,c
Select channel
c
on bank
b
of multiplexer
a
. Only one channel at a time is permitted to be on, automatic
break-before-make is always enforced.
b
is in the range 1 to 2.
e.g.
CHAN 3,1,7
will operate the module with address 3 selecting bank 1 channel 7.
CHAN 15,2,1
will operate the module with address 15 selecting bank 2 channel 1.
3.4.3 Single Multiplexer Mode
Each module contains a single 32 or 16 to 1 multiplexer.
CHAN a,b,c
Select channel
c
on bank
b
of multiplexer
a
.
3.5 Programming Examples
The following are simple examples of how to program the module in each of it’s 3 modes of operation:-
3.5.1 Single Multiplexer Mode
First, to check the size of the multiplexer at address 7.
TYPE? 7
will return “
MUX(16)
” (20-740 module).
To close channel 3 on multiplexer 7, bank 1.
CHAN 7,1,3
(or just
CHAN 7,3
)
Now to look at status of multiplexer 7.
VIEW? 7
will return “
3
”
To clear the multiplexer.
ARESET 7
Now to look at status.
VIEW? 7
will return “
0
".
3.5.2 Dual 16 to 1 Multiplexer Mode
First, to check the size of the multiplexer at address 21.
TYPE? 21
will return “
MUX(2[16])
” (20-745 module).
To close channel 3 (bank 1) on multiplexer 21.
CHAN 21,1,3
Now to look at status of multiplexer 21, bank 1.
VIEW? 21,1
will return “
3
”.
To clear bank 1.
ARESET 21,1
Or to clear both banks.
ARESET 21
Now to look at status.
VIEW? 21,1
will return “
0
".
VIEW? 21
will return the status of both multiplexer banks.
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