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Are H1, L1 and H2, L2 pins on the microcontroller? &nbsp;You haven't given us that datasheet.<br />
<br />
If your uC has two CAN ports, you can connect both of them to the bus and use the uC for network tests. &nbsp;If that is not of interest, you can just connect one of the ports.<br />
<br />
There seems to be some confusion at the system level.
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Are H1, L1 and H2, L2 pins on the microcontroller?  You haven't given us that datasheet.

If your uC has two CAN ports, you can connect both of them to the bus and use the uC for network tests.  If that is not of interest, you can just connect one of the ports.

There seems to be some confusion at the system level.

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No, HI, L1, H2, and L2 are not pins on the Microcontroller. &nbsp;These four lines are CAN Bus.
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No, HI, L1, H2, and L2 are not pins on the Microcontroller.  These four lines are CAN Bus.

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I don't see any HI, L1, H2, L2 in the data sheet. &nbsp;It is a 14-pin chip with one CAN port.<br />
<br />
But in general, a pair of wires come into the transceiver from a prior unit, and another pair goes out to the next. &nbsp;A CAN bus is enormous overkill for connecting two devices.
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I don't see any HI, L1, H2, L2 in the data sheet.  It is a 14-pin chip with one CAN port.

But in general, a pair of wires come into the transceiver from a prior unit, and another pair goes out to the next.  A CAN bus is enormous overkill for connecting two devices.

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Please see attached for CAN Bus Wiring.<br />
<a href="https://filedb.experts-exchange.com/incoming/2017/02_w07/1145675/CAN-Bus-Wiring.docx" target="_blank" class="file-inline" title="CAN Bus Wiring (29 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>CAN-Bus-Wiring.docx</a>
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Please see attached for CAN Bus Wiring.
CAN-Bus-Wiring.docx [https://filedb.experts-exchange.com/incoming/2017/02_w07/1145675/CAN-Bus-Wiring.docx]

CAN-Bus-Wiring.docx

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<div class="content wysiwyg-content">
Attached is CAN Transceiver Datasheet. This IC is wired in our Microcontroller based Electronic Control Unit.<br />
<br />
CAN_A_H1 and CAN_A_L1 are connected to CANH and CANL of Transceiver. &nbsp;Also, CAN_A_H2 and CAN_B_H2 are connected to same CANH and CANL ?<br />
<a href="https://filedb.experts-exchange.com/incoming/2017/02_w07/1145563/TJA1145T_FD-Transceiver.pdf" target="_blank" class="file-inline" title="CAN Transceiver (399 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>TJA1145T_FD-Transceiver.pdf</a>
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TJA1145T_FD-Transceiver.pdf

Attached is CAN Transceiver Datasheet. This IC is wired in our Microcontroller based Electronic Control Unit.

CAN_A_H1 and CAN_A_L1 are connected to CANH and CANL of Transceiver.  Also, CAN_A_H2 and CAN_B_H2 are connected to same CANH and CANL ?

Why Two pairs of CAN_H and CAN_L going into One CAN Transciever ?

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An embedded system is a computer system with a dedicated function within a larger mechanical or electrical system, often with real-time computing constraints. Examples of properties typical of embedded computers when compared with general-purpose ones are low power consumption, small size, rugged operating ranges, and low per-unit cost. Modern embedded systems are often based on microcontrollers; the processor(s) used may be types ranging from general purpose to those specialised in certain class of computations, or even custom designed for the application at hand. A common standard class of dedicated processors is the digital signal processor (DSP).

Embedded Hardware

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