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:
[e-mail].
• 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.
12
3
4
5
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.”

COPYRIGHT 2018 BLACK BOX CORPORATION. ALL RIGHTS RESERVED.
Documentation Number: pn710-00009-00_r2_ICD400A_2518qsg