"SerialPower" Software Examples & Network Stacks
"Combining power delivery and
bi-directional communications between intelligent nodes
using just two interchangeable wires"
Basic Network Stacks
A minimum "SerialPower" network configuration consists of a master node and a slave node. This section decsribes the main network stacks required.
- Master Node Software: -
A master node is application independent and the master node software is therefore the same for any application. The following link is available for the master node software as implemented on a Picaxe-08M: Master Node Network Stack
- Slave Node Software: -
A basic network stack for a slave node is available that implements a simple "dummy" process which registers itself to the master node as a sending process. In this way a slave node can be tested in a very simple way, since with a correctly functioning slave node the master node will generate timeslots for this dummy process (in case of several slave nodes: take care that each dummy sending process on each slave node gets a different, unique ID). The following link is available for the basic slave node network stack as implemented on a Picaxe-08M: Slave Node Network Stack
A number of simple, tested examples are available. Main goal is to illustrate the programming of the slave nodes for typical applications. The example code has been tested on the hardware as described at the end of this page. Note that since the test hardware used is based on a simple diode-mixing network, the example code uses this particular network setting as well and you may need to alter that for your particular application. All examples on this page are described in detail in the Architecture Document, Chapter 10.
Hint: Compare the example codes below in order to quickly locate the application dependent code parts in the slave node software. This comparison will help you to code your application much faster. Furthermore it reveals that a large part of the slave node software is actually application-independent.
- Example S1 -
In this example a switch at the slave node is read. Every time it is pressed a LED at the slave node is lit and a message is prepared that calls a master node process to flash the master node LED. Thus a simple application is available to demonstrate bidirectional communication between processes at a master and a slave node.
Example S1 is treated in detail in Chapter 10.1 of the Architecture Document.
The example code can be found here: Example S1 (slave node switch + master node LED response).
- Example T1 -
This example shows a very common use of a slave node, namely as a sensor that continuously measures and reports values to the network. In this example two DS18B20 digital temperature sensors are read and their values transmitted (in a single network message) to a display process (located on another slave node). Note that the application software takes care of the fact that on some PICAXES certain commands like READTEMP should be executed at 4MHz.
Example T1 is treated in detail in Chapter 10.2 of the Architecture Document.
The example code can be found here: Example T1 (temperature sensing & reporting).
- Example T2 -
EXample T2 is a direct extension in that the process that implements the temperature sensing is enabled by sending it a tenoerature threshold value. Only after a defined threshold value is exceeded the tenperatures will be reported. Furthermore the threshold may be varied in time; a process synchronization method is used to guarantee that any threshold chnage is accounted for properly by the temperature sensing and reporting process
Example T2 is treated in detail in Chapter 10.3 of the Architecture Document.
The example code can be found here: Example T2 (temperature sensing & reporting based on variable threshold value).
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