19.3.13len : Data Length
Format: 0lllllllB (LSB) 0mmmmmmmB (MSB)
As shown below, the meaning of this field differs depending on whether an individual transfer or a bulk parameter set transfer is being performed.
Individual Parameter Transfer
Data length indicates the length of the array being transferred minus 1 when the parameter contains a character string or other similar array structure.
Bulk Parameter Set Transfer
Data length indicates the number of bytes of data included within a packet. When this value is zero, it means there is no actual data.
19.3.14data : Parameter Data
Format: 0dddddddB | (0eeeeeeeB) | (0fffffffB) | (0gggggggB) | (0hhhhhhhB) |
:
:
Parameter data indicates the parameter value. Data that is the size of the number of arrays equivalent to len + 1 follows. For the structure of one data item, the length depends on the data bit width, as shown below.
dddddB + 1 | Number of Data | |
1 | - 7 | 1 |
8 - 14 | 2 | |
15 | - 21 | 3 |
22 | - 28 | 4 |
29 | - 32 | 5 |
Each block of data is packed from the lowest order byte first. In the case of
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
data0: | 0 | [bit06] [bit05] [bit04] [bit03] [bit02] [bit01] [bit00] | ||||||
data1: | 0 | [bit13] [bit12] [bit11] [bit10] [bit09] [bit08] [bit07] | ||||||
data2: | 0 | [bit20] [bit19] [bit18] [bit17] [bit16] [bit15] [bit14] | ||||||
data3: | 0 | [bit27] | [bit26] | [bit25] | [bit24] | [bit23] | [bit22] | [bit21] |
data4: | 0 | 0 | 0 | 0 | [bit31] | [bit30] | [bit29] | [bit28] |
19.3.15Single Parameter Data Size Limit
With the Instrument's system exclusive message format, the size of a single message cannot exceed 256 bytes. The data size and the array size, however, can cause a packet to exceed 256 bytes when transferring a single parameter array. In this case, the IPS and IPR message data length and data index number values can be modified to enable division of a single parameter value into multiple messages so it can be sent that way.
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