I-O Display Systems Basic I/O Product manual The Basic I/O, System Throughput

The Basic I/O 1

SYSTEM THROUGHPUT:

Input data throughput is the time from beginning of the first character of an input instruction to the end of the last character of the response. The processing time of the Host computer will affect the effective throughput.

Output Execution throughput is the time from the beginning of the first character of an instruction until the actual output changes. Because the instruction acknowledgment occurs before the outputs actually change state, the processing time of the host computer controlling output instructions can reduce the effective throughput. This is even possible at 38,400 baud to instruct the BASIC I/O to turn a digital output on and then immediately instruct it to turn

back off so quickly that the module never actually gets activated.

Tables below show milliseconds per channel and channels per second for 1 and 16 I/O channel cases.

	THROUGHPUT TABLES
	Input (Digital M)	Output (Digital J)
1 Channel	16 Channels	1 Channel	16 Channels

Baud Rate	mSec/	Chan/Sec		mSec/	Chan/ Sec
	Chan			16 Ch
300	501	2	501		32
600	251	4	251		64
1200	126	8	126		127
2400	64	16	64		252
4800	32	31	32		496
9600	17	60	17		962
19200	9	113	9		1816
38400	5	204	5		3261

mSec/	Chan
Chan	/Sec
379	3
195	5
104	10
58	17
35	29
23	43

1856

1567

mSec/ Chan /Sec 16 Ch

379 42

195 82

104 154

58 277

35 458

23 682

18902

151076

		Input (Analog L)					Output (Analog S)
	1 Channel			16 Channels			1 Channel		16 Channels
Baud Rate	mSec/	Chan/		mSec/	Chan/ Sec	mSec/		Chan	mSec/	Chan /Sec
	Chan	Sec		16 Ch		Chan		/Sec	16 Ch
300	639	2		2639	6	484		1984	2	8
600	323	3	1323		12	250	4		1000	16
1200	164	6	664		24	134	7		509	31
2400	85	12	335		48	75	13		263	61
4800	46	22	71		94	46	22		140	114
9600	26	39	88		181	32	32		78	204
19200	16	63	47		339	24	41		48	335
38400	11	91	27		602	21	48		32	494

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