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Software description of functions 12

Beckhoff Lightbus - PC interface card C1220

Code word

The C1220 outputs the code word after every reset of communication

channel 1. Here, this takes place without setting the Data Valid bit. The

purpose of the code word is to inform the PC that the C1220 interface card

is initialized and ready. The code word can also be queried at any time by

way of the 0x02 function.

ArgumentChannel Length Function

0 1 2

Comment

Request

02 0x02

04 0x02 fe af Correct code word

Software version

The version of the EPROM firmware can be queried by way of the 0x03

function.

ArgumentChannel Length Function

0 1 2

Comment

Request

02 0x03

04 0x03 xx xx Version xxxx

Evaluation of Parity Errors

If the peripheral modules are fitted with type 132 or BX415

(BK2000) SPROMs, it is possible to localise the sources of parity errors.

The master card produces a “parity error counter” (8 bits wide) for every

module present. This counter works without overflow.

The counter can be read by means of function 04.

ArgumentChannel Length Function

0 ..

128

Comment

Request

03 0x04 00 Transmit counter for modules 0 - 127

130 0x04 n ..

Counter for modules 0 – 127

(0 = non-localisable parity error)

Request

03 0x04 01 Transmit counter for modules 128 -255

130 0x04 n ..

Counter for modules 128 -255

Request

03 0x04 02 Reset counter

02 0x04 Counter reset

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 29 30

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Beckhoff C1220 Manuale Utente Pagina 12

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