SENA Parani-BCD110V3 - Manual (Page 27)

Sena Technologies, Inc 27
4. SPP (Serial Port Profile)
4.1. Overview
Parani-BCD110V3 conforms to field-proven standard SPP (Serial Port Profile). This chapter deals
with multiple connections out of SPP functions in detail.
Parani-BCD110V3 supports multiple connections up to 7 slave units. There are two types of
multiple connection modes: Multi-Drop Mode and Node Switching Mode.
Figure 4-1 Multi-Drop Mode
In Multi-Drop Mode a master unit can connect to maximum 7 slave units at the same time and
they transfer data bi-directionally as in Figure 4-1.
Figure 4-2 Node Switching Mode
In Node Switching Mode, the master unit maintains multiple connections with maximum 7 slave
units but only one connection with one slave unit is active and data is transferred as shown in
Figure 4-2. After connected to slave, master acts in command mode. Active slave is selected by
AT commands.
ATOx<CR>
, which is used to select a node to communicate with and where x is the number of slave.