Prior Scientific ProScan III - TTL Command Set

© Prior Scientific Instruments Ltd Version 1.12 June 2017 Page 69
ProScan® III Manual
4.17 TTL Command set
Command
Arguments
Response
TTL
Writes to TTL port. DCBA where DCBA
are Hexadecimal numbers assigned as
follows:-
A TTL_OUT least significant 4 bits B
TTL_OUT most significant 4 bits C TTL_IN
least significant 4 bits
D TTL_IN most significant 4 bits Since
TTL_IN are inputs to the controller only
i.e. cannot be written to, C and D should
both be 0 (any other value is ignored)
Acceptable formats are
TTL,000E writes TTL high to all 4
TTL_OUT bits except TTL_OUT 0 TTL,E
(as above)
0<cr>
H129 had 8 TTL IN/OUT bits
H130 only has 4 TTL IN/OUT bits
(B and D are ignored)
TTL
None
DCBA
BA is actual status of 4 Write Bits DC is TTL
levels of 4 Input bits. (leading zeros may be
omitted)
TTL
n,m
Where n is number 0 to 3 and is the data
bit number of TTL_OUT (see table above)
m is 0 or 1 and sets the level of TTL_OUT
m=0 is TTL low
m=1 is TTL high.
Note that it is important not to omit m or
it will be assumed by the controller that n is
a Hexadecimal number.
TTL
n,?
Returns m the TTL status of bit n
where n is the data bit number of the
m=0 is TTL low
TTL
m=1 is TTL high
TTL_OUT has n between 0 and 3
TTL_IN has n between 8 and 11
for backwards compatibility with H129
(See Hexadecimal nomenclature above