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When a multi-tap is connected to a peripheral port
- When connected to a multi-tap, the port mode indicates the maximum data size collected from peripherals connected to each tap. (This is not the total number of data collected from the entire multi-tap.)
If the connected peripheral is 15 bytes or less, the peripheral data configuration is 1 regardless of whether the port mode is 15 byte mode or 255 byte mode.
If the connected peripheral is 16 bytes or more and the port mode is 15 byte mode, only 15 bytes can be collected as in the peripheral data configuration 2.
If the connected peripheral is 16 bytes or more and the port mode is 255 byte mode, all data is collected as in the peripheral data configuration 3.
In addition, if the multi-tap itself has a maximum specification of 15 bytes for each tap, data of 16 bytes or more will be cut.
∙ Peripherals of 15 bytes or less and peripherals of 16 bytes or more may be connected together in a multi-tap. However, when issuing an INTBACK command, the port mode can only be set to 15 bytes or 255 bytes.
Therefore, the maximum data size that each tap can collect is defined as a multi-tap specification. When using multi-tap, set the port mode according to the maximum data size of the tap. In other words, if the multi-tap specification is up to 15 bytes, set the port mode to 15-byte mode, and if the multi-tap specification is up to 255 bytes, set the port mode to 255-byte mode.
In addition, Saturn 6P multi-tap has a maximum of 15 bytes per tap. Use port mode in 15-byte mode.
Table 3.9 shows combinations of multi-tap data size and port mode. The peripheral data configurations 1 to 3 in Table 3.9 are the same as those shown in Figure 3.16 to Figure 3.18.
∙ The connection status of each tap when using multi-tap is indicated by the saturn peripheral ID of each tap. When the tap is not connected and the UNKNOWN device is connected to the tap, the Saturn peripheral ID is output in the configuration shown in Figure 3.19 and Figure 3.20.
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