The TCC-80I is the world's first high-speed, serial port powered converter with 2.5 KV isolation. The TCC-80I draws power from the attached RS-232 device, and provides complete RS-232 to RS-422/485 interface conversion and electrical isolation protection. The TCC-80I converts between the RS-232 TxD and RxD lines and half duplex 2-wire RS-485, or full duplex 4-wire RS-422/485. The TCC-80I's outputs come with built-in 15 KV ESD surge protection to provide comprehensive protection against current overload. The TCC-80I also supports RS-485 automatic data direction control, in which the RS-485 driver is enabled by circuitry when the RS-232 TxD output is sensed. This means that no programming effort is required to control the direction of the RS-485 signal.

Serial RS-232 Port Power and Optical Isolation
The RS-232 port of the TCC-80I is designed with a female DB9 socket to connect directly to the host PC, with power drawn from the combination of TxD, RTS, and DTR lines. The electrical 2.5 KV isolation of the TCC-80I is achieved by using a photo coupler to transform an electrical signal into light, and then retransform the light back into an electrical signal on the other side. In this way, two electrical circuits are completely isolated from each other. This also protects the devices from ground loop currents, reduces damage caused by data loss, and prevents damage to the communication interfaces.

Patented LED Port Power Indicator
Although it is easy enough to use a multimeter to determine whether or not the attached serial port is able to provide enough electricity, a better method is to use the built-in "LED Port Power Indicator" designed especially for the TCC-80I. To do this, connect the TCC-80I to the target RS-232 port, and then turn the SW4 switch to the right to Test mode. If the LED lights up, the TCC-80I is receiving enough power. If the LED does NOT light up, you will need to attach the external power cord to the TCC-80I.

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