Moxa Technologies TCC-80I User Manual

RS-422/485 Connection

The RS-422/485 port to terminal block connector is shown below. Note that some RS-422/485 devices are labeled “+” and “-” and some are labeled “B” and “A”. In other words, Data (B) is equivalent to Data (+) and Data (A) is equivalent to Data(-).

RS-422/4w RS-485 2w RS-485

T+

T. R+/D+ R./D.

GND

R+ R. T+ T. GND

T+

T. R+/D+ R./D.

GND

D+ D. GND

RS-232 Pinouts

The female DB9 port for the RS-232 signal is shown in the following figure.

5 4 3 21

68 7

PIN RS-232

1 DCD 2 TxD 3 RxD 4 DSR 5 GND 6 DTR 7 CTS 8 RTS

Note: As shown above, RTS and CTS are

shorted, and DTR, DSR, DCD are shorted. This frees users from the hardware flow control cable wiring problem.

shorted

Isolated High-Speed Serial Port Powered

Serial Media Conversion Solution

USB Power Cord

If additional external power is required, TCC-80I can be connected to a standard 5 to 12 VDC power supply or the USB power cord CBL-USBAP-50.

Transio TCC-80I

First High-speed, Isolated, Self-powered RS-232 to RS-422, 2-wire/4-wire, RS-485 Bi-directional Converter with 2.5 KV Isolation and 15 KV ESD Surge Protection.

Overview

The TCC-80I is the world’s first high-speed, isolated, self-powered converter. It is powered via the host’s RS-232 port and provides complete signal

USB “A” Male Connector

Front:

To p:

conversion between RS-232 and RS-422/485 devices. The TCC-80I coverts back and forth between RS-232’s TxD and RxD lines to either half duplex 2-wire RS-485 or the balanced signal of full duplex 4-wire RS-422/485. In addition, the TCC-80I’s built-in 15 KV ESD surge protector provides the output ports with comprehensive

4 3 2 1

TCC-80I USB Connector Connector Pinouts Signals

1 +5 VDC 2 -3 -4 GND

DC Power Plug

TCC-80

CBL-USBAP-50

Cable Wiring

inner outer

USB

USB Host A Type Female

+5 VDC

GND

protection against surges and spikes. Perhaps the most important feature is the 2.5 KV isolation designed to prevent ground loop currents, reduce damage caused by data loss, and prevent damage to the communication interfaces. The TCC-80I is also designed to provide RS-485 auto data direction control, in which the RS-485 driver is enabled automatically when the circuitry senses the TxD output from the RS-232 signal. Programming effort is not required to control the transmission direction of the half duplex RS-485 signal.

Package Checklist

• TCC-80I

• USB Power Cord

• User’s Manual

Applications

• Multipoint data acquisition

• Factory automation

• Remote serial device control

• Building security automation

• Critical industrial control

Features and Specifications

• Signals:

RS-232: TxD, RxD and GND RS-422: TxD+(B) / -(A), RxD+(B) / -(A), GND RS-485: Data+(B) / -(A), GND

• Port types: RS-232: Female DB9

RS-422/485: Terminal Block

• Supports baudrate up to 115.2 Kbps

• RS-232 loopback: RTS to CTS; DTR to DSR

and also DCD

• Supports automatic RS-485 data direction

control with no baudrate switch settings

• 15 KV ESD for all RS-232/422/485 signals

• 2.5KV Optical Isolation

• Built-in 120 ohm termination resistors for

RS-422/RS-485 (DIP switch selectable)

• Supports up to 32 units connected in an RS-485

multi-drop network

• Serial Power Source: TxD, RTS and DTR

(RTS/DTR ON are recommended)

• LED Port Power Indicator (switch settings)

• Ext. Power (jack): DC +5V to +12V adapters or

a USB power cord (DC +5V)

• Operating temperature: 0 to 60°C

(32 to 140°F)

• Dimensions: 42 × 80 × 22 mm

• Case: ABS + PC

Ø5.1±0.1

Ø2.1±0.1

5-12 VDC

20 mA (max.)

• Weight: 50 ± 5 g

• CE, FCC Class B approval

• Power Consumption: 20 mA at +5 VDC

(termination disabled)

• Warranty: 2 years

Transio TCC-80I User’s Manual P/N: 1802000801000 First Edition.

Installation

Serial (RS-232) Port Power

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 TxD, RTS, and DTR lines. Although the TCC-80I is able to obtain enough power from the combination of the three data/handshake lines, regardless of whether the signal is high or low, it is highly recommended to activate the “ON” signal for either the RTS or DTR lines. For those applications that do not use the handshake lines, a DC jack is provided for connecting a 5 to 12 VDC power supply via a USB power cord or external power adaptor.

TXD

RTS

DTR

Serial Power Source/Data

±5 to ±12 VDC Signal

Port Power Dissipation

When installing an RS-232 port-powered TCC-80I converter, pay attention to the power consumption, RS-232 cable length, power provided by the serial port, and the RS-422 /485 transmission distance. In general, the TCC-80I itself gets 70 mW from the power source; a standard COM port on a host PC can provide 70 to 90 mW of power if the TxD, RTS, and DTR lines are connected. Moreover, the RS-232 cable length should be shorter than 15 m (@ 9600 bps) to ensure that less power is lost from the host/device to the TCC-80I. The rest of the supplied power is used for transmitting the RS-422/485 signal.

Serial Port Power Compatibility

Serial ports use a diversity of interface chips, but the power provided by the different ports is not always the same. In fact, some of the ports do not provide enough power to activate the TCC-80I. The on-board COM1 and COM2 ports seldom have problems. The table shows the add-on cards and the serial-to-Ethernet device servers that have been tested as a good power source to drive the TCC-80I when their RTS/DTR is connected and in the “ON” state.

RS-422/485 Devices

Multiport Serial Boards Serial Device Servers

MOXA Smartio CP-118U CP-168U V2 CP-104U V2

MOXA NPort 5110/5210 V2.1 5410 V2.2 5610 V3.0 (or later)

CP-102U MOXA Smartio

CP-118EL Series

MOXA USB

NPort U1110 CP-168EL Series CP-104EL Series

MOXA USB to Serial

UPort 1410/1610

LED Port Power Indicator

Optional External Power

Termination is a critical requirement for port-power devices such as the TCC-80I. In most circumstances, termination resistors are used when the RS-422/485 cable length is longer than 100 m. Regardless of how much the data signal dissipates, the termination resistors absorb more than 75 mW of power from the power source when the TCC-80I is unable to use the limited serial power. In other words, if long distance RS-422/485 transmission or termination is required, then an external USB power cord or DC power supply should be used.

Data

TXD

RS-422/485 Devices

The best way to ensure that the attached serial port provides enough electricity to the TCC-80I is to check the power indicator LED on the front panel. 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.

Data

TXD

RTS

DTR

USB Port Power Cord

Long Range/ Terminated RS-422/485 Connection

Note: Be sure to turn the SW4 switch back to Std.

mode (the default) when you finish testing. When in Test mode, the TCC-80I WILL NOT transmit data.

By testing the TCC-80I at different baudrates and transmission distances, we have determined the

5 to 12 VDC Ext. Power Adaptor

maximum transmission distances that can be achieved when using serial port power. The test results are shown in the following table.

Port Powered Transmission Distance

Std.

Mode

SW4

Tes t

Mode

(bps)

9600 19200 38400 57600

115200

Baudrate

RS-422/485

Transmit

Distance (m)

1200 1200

600 300 150

Embedded

Terminator

(ON) 120Ω (ON) 120Ω (ON) 120Ω (ON) 120Ω (ON) 120Ω

Ext. Power

Required

NO NO NO NO NO

Switch and Jumper Settings

To change the operation mode, check the DIP Switch settings on the back panel.

123

DIP Switch Settings

RS-422

RS-422 with

Terminator

4-wire RS-485

4-wire RS-485 with

Terminator

2-wire RS-485

2-wire RS-485 with

Terminator

SW1 SW2 SW3 OFF OFF OFF SW1 SW2 SW3 OFF OFF ON SW1 SW2 SW3

ON OFF OFF

SW1 SW2 SW3

ON OFF ON

SW1 SW2 SW3

ON ON OFF

SW1 SW2 SW3

ON ON ON

DIP Switches SW1 and SW2 are used to select the operation modes (RS-422, 4W RS-485, or 2W RS-485). Termination is controlled by DIP Switch SW3.

Ext. Power Supply

The TCC-80I is designed to be connected to a standard 5 to 12 VDC power adapter if additional external power is required.

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