BECKHOFF C1220 - Manual (Page 22)

Eiserstraße 5 / D-33415 Verl / Telefon 05246/963-0 / Telefax 05246/963-149
Software description of functions 22
Beckhoff Lightbus - PC interface card C1220
Initialisation of string communication
String communication is initialised via the handshake channel with function
0x14.
Argument Channel Length Function
0 1 2 3
Request 0x0A 0x14 Init
StringComm.
(0x01) CDL no.
string Trns CDL no.
string receive Max. string
length
Request 0x03 0x14 Deinit
StringComm.
(0x00)
Deactivation of string communication also
deactivates all the string slaves.
Reply 0x03 0x14 0x00 No error.
0x01 Wrong CDL number for string transmit CDL.
0x02 String transmit CDL already occupied.
0x03 Wrong CDL number for string receive CDL.
0x04 String receive CDL already occupied.
0x05 Wrong transmit string base address.
0x06 Wrong receive string base address.
Argument
4 5 6 7
Offset string transmit buffer Offset string receive buffer
Deactivation of string communication also deactivates all the string
slaves.
No error.
Wrong CDL number for string transmit CDL.
String transmit CDL already occupied.
Wrong CDL number for string receive CDL.
String receive CDL already occupied.
Wrong transmit string base address.
Continuation of the table
Wrong receive string base address.