Appendix B
B-1
I/O Performance
The I/O PLEXER samples individual analog inputs at the constant rate of 100
samples per second. The effective sample rate per channel is determined by the
total number of channels to be sampled.
Input data throughput is based on the time from the beginning of the first
character of an instruction to the end of the last character of the response. The
response time of the Host computer controlling input instructions will reduce the
effective throughput.
Output execution throughput is based on the time from the beginning of the first
character of an instruction to the time when an actual output changes. Because
the instruction acknowledgment response occurs before outputs actually change
state, processing time of the Host computer controlling output instructions can
reduce the effective throughput.
The tables below show msec per channel and channels per second for 1 and 16
I/O channel cases.
Baud
Output
(Digital
J)
Input
(Digital M)
Rate
1 Ch/
IOP
16 Ch/
IOP
1 Ch/
IOP
16 Ch/
IOP
mSec/
chan
chan/Sec
mSec/
16 chan
chan/
Sec
mSec/
chan
chan/Sec
mSec/
16 chan
chan/
Sec
300
501
2
501
32
379
3
379
42
600
251
4
251
64
195
5
195
82
1200
126
8
126
127
104
10
104
154
2400
64
16
64
252
58
17
58
277
4800
32
31
32
496
35
29
35
458
9600
17
60
17
962
23
43
23
682
19200
9
113
9
1816
18
56
18
902
38400
5
203
5
3261
15
67
15
1076
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