Echelon I/O Model Reference for Smart Transceivers and Neu Uživatelský manuál stáhnout pdf (Strana 114)

104 Serial I/O Models

Parity is not supported for this model. The application code can use bit I/O pins

for flow control handshaking if required.

START

STOP

Figure 37. Serial Input and Timing

Table 37. Serial Input Latency Values for Series 3100 Devices

Symbol Description Typical at 10 MHz

fin

Function call to input sample

Min (first sample)

Max (timeout)

67 μs

20 byte frame

ret

Return from function 10 μs

The duration of this function call is a function of the number of data bits

transferred and the transmission bit rate. t

fin

(max) refers to the maximum

amount of time this function waits for a start bit to appear at the input. After

this time, the function returns a 0 as data. t

fin

(min) is the time to the first

sampling of the input pin. For example, the timeout period at 2400 bits/second is

(20 x 10 x 1/2400) + t

fin

(min).

1 2 ... 109 110 111 112 113 114 115 116 117 118 119 ... 208 209

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Echelon I/O Model Reference for Smart Transceivers and Neu Uživatelský manuál Strana 114