CIRCUTOR computer SMART III-Fast Series - Manual (Page 70)

4�10�1� MODBUS CONTROL FRAME
The Computer SMART III FASTcontrolstheCPC3iboardsusingtheMODBUSprotocol�
Inparticular,itsendsaframeevery200ms,using Function 15:Nbitswrite�
Themessageisa"broadcast"message,i�e�,itwillbereadbyallboards,inanyaddress�
Theformatoftheframeisasfollows:
Address
Func-
tion
Direction
of 1st bit
No� of bits
No� of
bytes
Bits value CRC
00 0F 0064 0040 08 DD0 to DD7 XXXX
Address: 00,Broadcast,alltheCPC3iboardsreceivealltheframes�
Function: 0F,Writefunction�
Direction of 1st bit: 0064,thedirectionofthe1stbitintheCPC3iboardis0x0064�
No� of bits: 0040,theframehas64bits�
No� of bytes: 08,groupedinto8byes�
Bits value: Themeaningofthe8bytesisdetailedin Table 39 �
CRC: XXXX,CRCcharacter�
Table 39: Meaning of the 8 bytes, DD0 - DD7�
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DD0 - thy3_np2 thy2_np2 thy1_np2 - thy3_np1 thy2_np1 thy1_np1
DD1 - thy3_np4 thy2_np4 thy1_np4 - thy3_np3 thy2_np3 thy1_np3
DD2 - thy3_np6 thy2_np6 thy1_np6 - thy3_np5 thy2_np5 thy1_np5
DD3 - thy3_np8 thy2_np8 thy1_np8 - thy3_np7 thy2_np7 thy1_np7
DD4 - thy3_np10 thy2_np10 thy1_np10 - thy3_np9 thy2_np9 thy1_np9
DD5 - thy3_np12 thy2_np12 thy1_np12 - thy3_np11 thy2_np11 thy1_np11
DD6 - thy3_np14 thy2_np14 thy1_np14 - thy3_np13 thy2_np13 thy1_np13
DD7 - thy3_np16 thy2_np16 thy1_np16 - thy3_np15 thy2_np15 thy1_np15
thyn_npxmeansthyristornoftheblockorperipheralx(Thisnumberofperipheral,x,isthe
oneprogrammedintherotatingselectorforeachboard)�
NB:Theframeasksforthetransmissionofdatatothyristorsinupto16differentsteps,phase
byphase�The Computer Smart III FASTregulatorhasamaximumof12outputs,soitdoes
notusethelast4stepsoftheframe�
70
Computer SMART III FAST
Instruction Manual