Quatech INTERBUS S manual Status Indicators

- As soon as TA = TR, the data has been transferred to the output buffer.

Input byte 0	Status byte	Input byte 2	Input byte 1
XX	0XXX.XXX1	XX	XX
XX	0XXX.XXX0	XX	XX

The data is still being transferred.

Data transfer completed.

Receiving the character chain “WAGO”

-As soon as RA≠RR, the input bytes contain data.

Output byte 0	Control yte	Output byte 2	Output byte 1
XX	0XXX.000X	XX	XX

Input byte 0

XX

‘W’ (0 x 57)

Status byte	Input byte 2
0XXX.0X0X	XX
0011.0X1X	‘G’ (0 x 47)

Input byte 1

XX

‘A’ (0 x 41)

No received data available.

The information is in the input bytes.

-After the 3 characters have been processed, RA is inverted.

Output byte 0 Control byte

Output byte 2 Output byte 1

XX

0XXX.001X XX

XX

- If RA≠RR, the receiving of additional characters will continue.

Input byte 0

XX

‘O’ (0 x 4F)

Status byte	Input byte 2
0XXX.0X1X	XX
0001.0X0X	XX

Input byte 1

XX

XX

No received data available.

The information is in the input bytes.

-After the characters have been processed, RA is inverted.

Output byte 0	Control byte
XX	0XXX.000X

Output byte

XX

Output byte

XX

Notes:

0 x 23 is a hexadecimal value

0101.1001 is a binary value

An X indicates that this particular value has no importance. XX indicates that the whole value has no importance.

Status Indicators:

The 3 green LEDs have the following function:

Function

Output Status TxD

Non-Function

Input Status RxD

RS232,TTY,RS485￿￿￿￿￿￿￿￿ 750-650,651,653 9

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