Communication terminal for constructing daisy chain communication network without distinction between input connector and output connector

1. A communication terminal which is connected via a serial communication network, the communication terminal comprising:

a control unit having an input port and an output port;

a first connector electrically connected to the input port and the output port;

a second connector electrically connected to the input port and the output port;

a first-first diode electrically connected between the first connector and the input port to allow an electric current to flow in a direction from the first connector toward the input port;

a first-second diode electrically connected between the first connector and the output port to allow an electric current to flow in a direction from the output port toward the first connector;

a second-first diode electrically connected between the second connector and the output port to allow an electric current to flow in a direction from the output port toward the second connector; and

a second-second diode electrically connected between the second connector and the input port to allow an electric current to flow in a direction from the second connector toward the input port,

wherein the control unit measures an electrical characteristic value of a secondary battery.

2. The communication terminal according to claim 1 , wherein the input port receives a signal for waking up the control unit in a sleep state.

3. The communication terminal according to claim 1 , wherein the output port outputs a signal for waking up other control unit in a sleep state.

4. The communication terminal according to claim 1 , wherein the serial communication network is a daisy chain.

5. The communication terminal according to claim 1 , wherein the electrical characteristic value of the secondary battery is a value of at least one of voltage and current of the secondary battery.

6. A battery pack comprising:

a battery management system comprising a communication terminal according to claim 1 ; and

a plurality of battery modules comprising a plurality of secondary batteries electrically connected.

7. The battery pack according to claim 6 , wherein each battery management system is electrically connected to each battery module.

8. A battery operating system comprising:

a battery pack according to claim 7 ; and

a load which is supplied with power from the battery pack.

9. The battery operating system according to claim 8 , wherein the load is an electrical drive means or a portable device.