Black Box ICD400A User manual

ICD400A

ISOLATED

RS-232 TO

RS-422/485

CONVERTER

QUICK START GUIDE

24/7 TECHNICAL SUPPORT AT 877.877.2269 OR VISIT BLACKBOX.COM

STEP 1 - Specifications

• Complies with FCC Class B and CE requirements.

• Withstands temperature variations from -40 to +80

°C (-40 to +176 °F)

STEP 2 - What’s Included

Your package should include the following items. If

anything is missing or damaged, contact Black Box

Technical Support at 877-877-2269 or visit:

info@blackbox.com.

• RS-232 to RS-422/485 Converter

• This Quick Start Guide

• 10-to 30-VDC power connector

USER-SUPPLIED COMPONENTS

• DIN rail clip (DRCLIP), optional

STEP 3 - Controls and Indicators

Figure 3-1 shows the isolated RS-232 to RS-422/485

converter. Table 3-1 describes its components.

Figure 3.1 Model ICD400A

TABLE 4-1. DB9 DCE FEMALE CONNECTOR PINOUT

Pin Signal Direction Pin Signal Direction

1DCD

—

6DSR —

2RD Output 7 RTS —

3TD Input 8CTS —

4DTR — 9 RI —

5GND — — — —

NOTE: PIns 1, 6, and 4 are tied together internally. Pins 7 and 8 are tied together internally.

TABLE 3-1. CONVERTER COMPONENTS

ID in Fig. 3-1 Component Description

1Power connector

2-position, removable

2DB9 female connector RS-232 (wired as DCE)

3Data LEDs

Green: ON when power is applied

Blinking: Data is flowing

4Mounting ears Used for panel mounting

5R2-422/485 connector 5-position, removable

*6 8-position DIP switch Located on back of unit

Figure 3.2 DIP switch (located on back of unit).

NOTE: Shaded black means the DIP switch is ON.

STEP 4 - Pinouts and Terminal Identification

*See Figure 3-2.

Figure 4-1 and Table 4-1 describe the RS-232

connector pinout.

Figure 4-1. DB9 connector pinout.

STEP 5 - Power Connection

Connect your external power supply to the 2-position

power terminal block A. The polarity is indicated on the

front label. The converter will accept 10 to 30 VDC, 1.0

W maximum. The terminal block will accept 28 to 12

AWG wire.

TABLE 4-2. TERMINAL IDENTIFICATION

RS-422/485 4-Wire RS-485 2-Wire

AGround A

Ground

BRDB(+) BData B(+)

CRDA(-) CData A(-)

DTDB(+) D —

ETDB(-) E —

A B C D E

Power supply

10–30 VDC, 2.5 W

V(-) V(+)

Figure 4.2 Terminal Identification

Figure 4-2 and Table 4-2 show the terminal

identification.

STEP 6 - Wiring Examples

In Figure 6-1, the converter is set up to use the internal

bias and no termination.

Figure 6.1 RS-485 2-wire example.

Figure 6-2. RS-485 4-wire example.

NOTE: Shaded black means the DIP switch is ON.

In Figure 6-2, the converter is set up to use internal

bias and no termination with four wires.

RS-485 4-wire DIP switch.* RS-422 4-wire DIP switch.*

* NOTE: Shaded black means the DIP switch is ON.

STEP 8 - Loopback Test

• Configure for RS-485 4-wire.

• Jumper terminals B to D and C to E.

• Connect a PC to the RS-232 port.

• TD and RD LEDs are ON when power is applied.

• Using hyperterminal or a similar program, connect

to the appropriate COM port. Turn off hyperterminal

local echo.

• Transmit data. The same data should be returned.

When data is sent and looped back, the TD and RD

LEDs blink on and off indicating data flow.

STEP 7 - Bias and Termination

The circuit can be biased using the built-in 2k Ohm

pull-up and pull-down resistors. This is controlled with

DIP switch position 5. The default setting is ON (bias

resistors in).

When an RS-485 network is in an idle state, all nodes

are in listen (receive) mode. Under this condition, there

are no active drivers on the network. All drivers are

tri-stated. Without anything driving the network, the

state of the line is unknown. If the voltage level at the

receiver’s A and B inputs is less than ±200 mV, the logic

level at the output of the receivers will be the value of

the last bit received. To maintain the proper idle voltage

state, bias resistors must be applied to force the data

lines to the idle condition.

If termination is necessary on the receive lines, a

built-in 120 Ohm resistor can be switched in using DIP

switch position 6. In most cases, termination is not

required. The default setting is OFF (termination out).

Termination is used to match impedance of a node to

the impedance of the transmission line being used.

Termination increases load on the drivers, requires

installation complexity, changes biasing requirements,

and makes system modification more difficult.

Generally, termination should only be used for long

distances. “If in doubt, leave it out.”

Documentation Number: pn710-00009-00_r2_ICD400A_2518qsg

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