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--- xnorit:public:summary:xnorduino [2024/10/10 20:56] – [Testing] timdv91
+++ xnorit:public:summary:xnorduino [2026/03/08 14:09] (current) – timdv91
@@ Line 51: / Line 51: @@
 ==== Termination brick ====
+{{ :xnorit:public:summary:xnorduino:ksnip_20241009-220424.png?200|}}
 A "smart" termination brick is implemented, in order to detect bus interruptions. This termination-brick contains termination resistors and a small microcontroller.
@@ Line 56: / Line 58: @@
 The termination brick power-consumption is extremely low, meaning that our 5V power-rail suffices as it's power source on even longer cable runs. The Bus-master reads an "heartbeat" from this termination brick in a 20 ms interval. The 24V power-rail gets enabled, whenever the termination brick is successfully detected by the master. The master disables the 24V power-rail within 50 ms, whenever the termination-brick gets disconnected. This feature functions fully automatically, without any human intervention.
-This feature was implemented, to prevent accidentally inserting 24V on standardized network equipment. Which could potentially cause damage on certain devices.
+This feature was implemented, to prevent accidentally inserting 24V on standardized network equipment. Which could potentially cause damage on certain devices. A red LED starts to blink on the master, whenever the termination module gets disconnected.
-Additionally, the termination brick measures temperature and the voltages of both power rails (as can be seen in the image underneath). {{ :xnorit:public:summary:xnorduino:ksnip_20241009-220424.png?200 |}}
+Additionally, the termination brick measures temperature and the voltages of both power rails (as can be seen in the right image). A red LED starts to blink on the master, whenever the voltage drop across master and termination modules become to large.
+\\
+\\
 ==== Power monitoring ====
-Our 24V power-rail has a maximum current that depends on the utilized cat-cable. I therefore implemented a digital current-sense IC on the master, which disables the 24V power-rail pro-grammatically whenever our current draw surpasses a certain pre-configured value. For safety reasons, any over-current detection disables the 24V rail permanently, until human intervention resets the system.
+{{ :xnorit:public:summary:xnorduino:ksnip_20241009-221532.png?200|}}
-Additionally the power-monitor IC reads the 24V rail voltage at the beginning of the communication bus. The Termination-brick measures the 24V rail at the end of the bus, meaning we can calculate the voltage drop across our bus by subtracting these two.
+Our 24V power-rail has a maximum current that depends on the utilized cat-cable. I therefore implemented a digital current-sense IC on the master, which disables the 24V power-rail pro-grammatically whenever our current draw surpasses a certain pre-configured value. For safety reasons, any over-current detection disables the 24V rail permanently, until human intervention resets the system by clicking the "reset" button (visible in image at the right). A red LED will indicate the over-current trigger on the PCB itself.
-{{ :xnorit:public:summary:xnorduino:ksnip_20241009-221532.png?200 |}}
+Additionally the power-monitor IC reads the 24V rail voltage at the beginning of the communication bus. The Termination-brick measures the 24V rail at the end of the bus, meaning we can calculate the voltage drop across our bus by subtracting these two.
+\\
+\\
+\\
+\\
+\\
 ===== Bus-Slaves =====
@@ Line 74: / Line 84: @@
 Below are some (approved) example images of various slave devices.
+  * PWM Fan controller
+  * Current and voltage sense
+  * 16 bit ADC modules
+  * Humidity and temperature module
+  * Weather station module
+  * LED driver modules
+  * etc ...
 {{:xnorit:public:summary:xnorduino:img-20210903-wa0003.jpg?400|}}
@@ Line 97: / Line 114: @@
 A small mounting module was 3D printed, in order to install the Master module inside an Raspberry pi din-rail enclosure. Some example pictures are provided below.
-{{ :xnorit:public:summary:ksnip_20241010-225529.png?600 |}}
+{{ :xnorit:public:summary:xnorduino:ksnip_20241010-225529.png?600 |}}
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 {{:xnorit:public:summary:xnorduino:ksnip_20241010-224705.png?385|}}
+{{:xnorit:public:summary:xnorduino:ksnip_20241010-224713.png?400|}}
 {{:xnorit:public:summary:xnorduino:ksnip_20241010-224722.png?400|}}
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