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, a nd 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 li nes and half duplex 2-wire RS-485, or full duplex 4-wire RS-422/485. The TCC-8 0I's outputs come with built-in 15 KV ESD surge protection to provide compreh ensive protection against current overload. The TCC-80I also supports RS-485 automatic data direction control, in which the RS-485 driver is enabled by circuit ry when the RS-232 TxD output is sensed. This means that no programming eff ort 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 directl y to the host PC, with power drawn from th e combination of TxD, RTS, and DTR lines. T he 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 comple tely isolated from each other. This also protects the devices from ground loop c urrents, reduces damage caused by data loss, and prevents damage to the co mmunication interfaces.
Patented LED Port Power Indicator Although it is easy enough to use amultimeter to determine whether or not the attached serial port is able to provide enough electricity, abetter 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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