TCC-80Port-powered RS-232 to RS-422/485 converter

› External power source supported but not required 

› Compact size 

› Converts RS-422, and both 2-wire and 4-wire RS-485

› RS-485 automatic data direction control 

› Automatic baudrate detection 

› 15 KV serial ESD protection

› Built-in 120-ohm termination resistors

The TCC-80 provides complete signal conversion between RS-232 and 

RS-422/485, without requiring an external power source. It supports 

both half duplex 2-wire RS-485 and full duplex 4-wire RS-422/485, 

either of which can be converted between RS-232’s TxD and RxD lines. 

In addition, the TCC-80’s 15 KV ESD protection guards against damage 

from electrostatic discharge.

Automatic data direction control is also provided for RS-485, in 

which the RS-485 driver is enabled automatically when the circuitry 

senses the TxD output from the RS-232 signal. This means that no 

programming effort is required to control the transmission direction of 

the RS-485 signal.

The RS-232 port of the TCC-80 is a DB9 female socket that can 

connect directly to the host PC, with power drawn from the TxD, 

RTS, or DTR line. Regardless of whether the signal is high or low, 

the TCC-80 can obtain enough power from the data/handshake line. 

However, external power can be used if the handshake line is not 

available, if the serial cable is too long, or if the RS-232 device is a low 

power device. For external power, a 5 to 12 VDC power supply can be 

connected using an adaptor or a USB power cord

When installing a TCC-80 converter, it is important to pay attention 

to power consumption, RS-232 cable length, and RS-422/485 

transmission distance. In general, the TCC-80 obtains 50 mW from 

the power source. Standard PC COM ports can provide 70 to 90 mW 

of power if the TxD, RTS, and DTR lines are connected. Moreover, 

Port Power Dissipation

the RS-232 cable should be shorter than 15 m (@ 9600 bps) to 

ensure that less power is lost from the host/device to the TCC-80. 

The remainder of the supplied power is used for transmitting the 

RS-422/485 signal.

Specifications

PIN RS-232

1 DCD

2 TxD

3 RxD

4 DSR

5 GND

6 DTR

7 CTS

8 RTS

DB9 female

connector

DIP Switch Settings

5 4 3 2 1

9 8 7 6

RS-232 Side

Connector: DB9 female

Signals:

RS-232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND

(Loop-back wiring: RTS to CTS, DTR to DSR and DCD)

RS-422/485 Side

Connector: Terminal Block or DB9 male

Signals (interface selected by DIP switch):

RS-422: TxD+, TxD-, RxD+, RxD-, GND

RS-485-4w: TxD+, TxD-, RxD+, RxD-, GND

RS-485-2w Signals: Data+, Data-, GND

RS-485 Data Direction Control: ADDC® (automatic data direction 

control)

Serial Transmission

Baudrate: 300 bps to 115.2 Kbps

ESD Protection: 15 KV

Pull High Resistance: 1k ohm

Pull Low Resistance: 150k ohm

Physical Characteristics

Case: ABS + PC

Weight: 50 ± 5 g

Dimensions: 42 x 80 x 22 mm (1.65 x 3.15 x 0.87 in)

Environmental Limits

Operating Temperature: 0 to 60°C (32 to 140°F)

Operating Humidity: 5 to 95% RH

Storage Temperature: -20 to 75°C (-14 to 167°F)

Power Requirements

Source of Input Power: RS-232 port (TxD, RTS, DTR) or power input 

jack

Input Voltage: 5 to 12 VDC

Power Consumption: 10 mA @ 5 V (with termination disabled)

Surge Protection: Embedded 15 KV ESD Surge Protection

Regulatory Approvals

CE: Class B

FCC: Class B

Warranty

Warranty Period: 5 years

Details: See www.moxa.com/warranty

Ordering Information

Optional Accessories (can be purchased separately)

Package Checklist

• TCC-80 media converter

• USB power cord (50 cm)

• Quick Installation Guide (printed)

• Warranty Card

Available Models

TCC-80: Port-powered RS-232 to RS-422/485 converter with 15 KV serial ESD protection and 

terminal block on the RS-422/485 side

TCC-80-DB9: Port-powered RS-232 to RS-422/485 converter with 15 KV serial ESD protection 

and DB9 male connector on the RS-422/485 side

Power Adaptor

CBL-F9M9-20: DB9 male to DB9 female RS-232 cable (20 cm)