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36	36	The complete schematic can be downloaded [[HERE>>attach:LSS 2MC Board V0.3.pdf]].
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38		-(% class="wikigeneratedid" %)
39		-= Protocol =
	38	+= Communication =
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41	41	Using the LSS-2MC with it's example code require the user to understand it's Protocol which is available [[HERE>>doc:.2mc-communication-protocol.WebHome]].
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43	43	**Internal Serial Connection**
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45		-In this mode, the board is effectively a "peripheral". In order to respond to LSS commands, it needs to be running appropriate code, or the default Lss2IO Arduino sample program. The pinout is as follows:
	44	+The board is effectively a "peripheral". In order to respond to LSS commands, it needs to be running appropriate code, or the default Lss2MC Arduino sample program.
	45	+Pinout is as follows:
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47	47	* ATMega328P's Tx pin (D1) is connected to the LSS Tx line through a [[tri-state buffer (IC3)>>https://en.wikipedia.org/wiki/Three-state_logic||rel="noopener noreferrer" target="_blank"]] that can be enabled or disabled with pin D14.
48	48	* ATMega328P's Rx pin (D0) is connected to the LSS Rx line.
49	49
50		-Therefore data that is sent from an external UART device will be received on the LSS Rx line and the ATMega328P Rx pin. The LSS 2IO USB-to-Serial IC Tx is connected to the ATMega328P Rx (pin D0) through another [[tri-state buffer (IC4)>>https://en.wikipedia.org/wiki/Three-state_logic||rel="noopener noreferrer" target="_blank"]] that can be enabled/disabled with pin D7. The Lss2IO Arduino code inherently takes care of managing the pins D14 and D7 as follows :
	50	+Therefore data that is sent from an external UART device will be received on the LSS Rx line and the ATMega328P Rx pin. The LSS-2MC USB-to-Serial IC Tx is connected to the ATMega328P Rx (pin D0) through another [[tri-state buffer (IC4)>>https://en.wikipedia.org/wiki/Three-state_logic||rel="noopener noreferrer" target="_blank"]] that can be enabled/disabled with pin D7. The Lss2MC Arduino code inherently takes care of managing the pins D14 and D7 as follows :
51	51
52		-* **D7 **is LOW**: **to disconnect LSS 2IO USB-to-Serial IC Tx from ATMega328P Rx (pin D0) allowing the ATMega328P to receive data from the UART controller device as LSS 2IO USB-to-Serial IC Tx is HIGH when LSS 2IO is powered.
53		-* **D14** is HIGH**:** when the 2IO Board is sending data on the LSS Tx line to an external UART device Rx pin. LSS Tx line is asserted to the 2IO Tx pin :
	52	+* **D7 **is LOW**: **to disconnect 2MC USB-to-Serial IC Tx from ATMega328P Rx (pin D0) allowing the ATMega328P to receive data from the UART controller device as 2MC USB-to-Serial IC Tx is HIGH when 2MC is powered.
	53	+* **D14** is HIGH**:** when the 2MC Board is sending data on the LSS Tx line to an external UART device Rx pin. LSS Tx line is asserted to the 2MC Tx pin :
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55		-{{lightbox image="LSS-2IO-Schematic-2RC-D14HIGH.png" width="900"/}}
	55	+{{lightbox image="https://wiki.lynxmotion.com/info/wiki/lynxmotion/download/servo-erector-set-system/ses-electronics/ses-modules/lss-2io-board/WebHome/LSS-2IO-Schematic-2RC-D14HIGH.png" width="900"/}}
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57	57	* **D14 **is LOW**:** when the 2IO Board is not sending data on the LSS Tx line. The 2IO frees up the LSS Tx line to avoid bus congestion (when 2 devices sends data at the same time) :
58	58
59		-{{lightbox image="LSS-2IO-Schematic-2RC-D14LOW.png" width="900"/}}
	59	+{{lightbox image="https://wiki.lynxmotion.com/info/wiki/lynxmotion/download/servo-erector-set-system/ses-electronics/ses-modules/lss-2io-board/WebHome/LSS-2IO-Schematic-2RC-D14LOW.png" width="900"/}}
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61		-{{warningBox warningText="**NOTE:** Double check that the Lss2IO Arduino program is loaded in the 2IO's ATMega328P to be able to use this mode"/}}
	61	+{{warningBox warningText="**NOTE:** Double check that the Lss2MC Arduino program is loaded in the 2MCs ATMega328P to be able to use this mode"/}}
62	62
63	63
64	64	= Pinout =