Casio Personal Computer CTK-900 Manual De Usuario

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For a bulk data transfer operation, the Parameter Set data to be transferred is read sequentially in 16-bit data 
starting from the top address. Read values are divided into 3-byte segments as shown below, and then sent in 
sequence. 
The following is the conversion format, which is the same as the individual parameter 16-bit transfer detailed 
above. 
16-bit Memory Image
Note, however, that a parameter set of 128 bytes or less can be sent using a single packet, and anything greater 
than 128 bytes is divided among multiple packets. 
This means that the maximum length "data" field is 128/2 
× 3 = 192 bytes. 
Only one parameter set can be transferred per session, and data from different parameter sets cannot be mixed 
within a single packet, even when sending multiple parameter sets. Different parameter sets are always divided into 
separate packets. 
17.2.12
12...sum Check Sum 
This field is always empty. 
In this case, the "sum" field contains a value, which, when added to the total value of the "data" field, makes the 
lower seven bits 0. The receiving side checks if this is true, and performs error handling (re-request, etc.) if it is 
not. 
17.2.13
14...EOX : End of System Exclusive Message 
(End of System Exclusive message Status = F7H) 
When 
act = 02(BDS) or 04(HDS)
Format:
0dddddddB
0cccccccB
000000abB
MSB:
abccccccB 
LSB:
cdddddddB 
data0:
0dddddddB 
data1:
0cccccccB 
data2:
000000abB
When 
act = 00(IPC), 01(IPR), 03(BDR), 05(HDR) or 7(EOD, HDA, HDJ, HDE, BSY, EOS, NOP)
Format: -
When 
act = 02(BDS) or 04(HDS)
Format:
0sssssssB
Format:
11110111B