BECKHOFF C1300 - Manual (Page 13)

C1300 VME to II/O Interface Unit Beckhoff II/O-System
Date : 18.12.95 Version : 2.01 Page 13 of 44
3.2. Description of the Handshake Channels
Communications between VMEbus and C1300 are supported by two channels, which contain
255 bytes. The VME master writes the data, needed to run a certain function, to channel 0 and
then transmitts a DV ( data valid ) signal. When the module has received all of the data, it
will send the "Quit" signal. The VME master erases the DV signal and as soon as the "Quit"
signal is set to zero, new communications can be started.
Channel 0 leading from the VMEbus to the C1300 module has an address range from C01h to
CFFh. DV is the MSB of address C00h. "Quit" is the second highest bit of address D00h.
Handshake-Channel 0 :
Byte 0
COOh
Byte 1 ................ Byte 254 Byte 255
CFFh
Channel 1 leading from the VMEbus to the C1300 module has an address range from C01h to
CFFh. DV is the MSB of address C00h. "Quit" is the second highest bit of address D00h.
Handshake-Channel 1 :
Byte 0
D00h
Byte 1 ................ Byte 254 Byte 255
DFFh