Black Box SP385A-R3 User manual

STEP X - Name of Step
24/7 TECHNICAL SUPPORT AT 877.877.2269 OR VISIT BLACKBOX.COM
SP385A-R3, SP390A-R3
USB TO RS
CONVERTER
QUICK START GUIDE

STEP 1 - Package Includes/System Requirements
PACKAGE INCLUDES
Your package should include the following
items. If anything is missing or damaged,
contact Black Box Technical Support
at 877-877-2269 or [e-mail]
• USB TO RS-232 OR RS-422/485
ISOLATED CONVERTER
• 3.2-FT. (1-M) USB CABLE
SYSTEM REQUIREMENTS
• ONE USB 1.1 OR 2.0 PORT FOR EACH
INSTALLED DEVICE
• AMBIENT AIR TEMPERATURE: 32 TO
158° F (0 TO 70° C)
NOTE: The devices work with USB 1.1 or 2.0
ports, but have a maximum USB data rate of
12 Mbps.
The USB port can be native to the device, or it
can be a USB port from an installed USB hub
to the PC.
SP390A-R3
USB Type B
connector
TD LED
5-pin terminal
block connector
RD LED
SP385A-R3
DB9 connector
RD LED
TD LED
USB Type B
connector

STEP 2 - Set the DIP Switch on the SP390A-R3
SET THE DIP SWITCH (SP390A-R3)
NOTE: If you have the SP385A-R3, you can
skip this step.
Set the DIP switches on the SP390A-R3 for 2- or
4-wire operation.
TABLE 1. SP390A-R3 DIP SWITCHES
SWITCH OFF ON
1 TD always enabled (TD 422) TD only enabled during data transmission (TD 485)
2RD always enabled (ECHO ON) RD disabled during data transmission (ECHO OFF)
3 Four-wire mode (4-wire) Two-wire mode (2-wire)
4 Four-wire mode (4-wire) Two-wire mode (2-wire)

STEP 3 - Plug in the Converter/Check the Installation
PLUG IN THE CONVERTER
1. Using the included USB cable, plug the
Converter into an available USB port on your
PC or USB hub.
2. Using a serial cable (not included), plug
the DB9 or terminal block connector on the
converter into the RS-232 or RS-422/485
device.
CHECK THE INSTALLATION
1. Open Windows Device Manager.
2. Scroll down to Ports.
3. Expand ports by clicking on the plus sign.
This shows if the ports now exist on the PC.
If there are no exclamation points or other
indicators of a problem, the ports should be
installed correctly and ready for use.
VERIFY WITH A LOOPBACK TEST
1. For RS-232 or 4-wire RS-485, verify with a
loopback test. See RS-232 or RS-422/485
pinout chart for location of pins.
NOTE: For 2-wire RS-485, you cannot do a
loopback test as it uses the same two wires for
transmit and receive in a half-duplex operation.
The unit can either transmit or receive it cannot
do both at the same time.
2. Using Hyperterminal or a similar program,
connect to the appropriate COM port. Set the
baud rate. Make sure Hyperterminal local echo
is OFF.
NOTE: Hyperterminal is not provided with
Windows Vista or 2003 Server.
3. Transmit data. If the same character string is
returned, the test is good.

STEP 4A - RS-232 Pinout for SP385A-R3
1
6
7
12
6
2345
345
789
8
9
TABLE 1. RS-232 AND TTL PINOUT (DB9 MALE DTE)
PIN SIGNAL NAME RS-232 SIGNALS TTL SIGNALS
1 DCD (Data Carrier Detect) Input Not used
2RD (Receive Data) Input Input
3TD (Transmit Data) Output Output
4DTR (DTE Ready) Output Not used
5 SG (Signal Ground) Ground Ground
6 DSR (DCE Ready) Input Not used
7 RTS (Request to Send) Output Output
8 CTS (Clear to Send) Input Input
9RI (Ring Indicator) Input Not used

STEP 4B - RS-422/485 Pinout for SP390A-R3
SP390A-R3 RS-422
Device
RDA (- )
RDB ( + )
TDA (- )
TDB ( + )
GND
TDA (- )
TDB ( + )
RDA (- )
RDB ( + )
GND
RS-485
Network
SP390A-R3
RS-485
Device
Data (B) Data (B)
Data (A) Data (A)
GND
TDA ( - ) TDB ( + ) RDA ( - ) RDB ( + ) GND
SP390A-R3 in a four-wire setup with all switches in the OFF position
SP390A-R3 in a two-wire setup with all switches in the ON position

STEP 5 - Download the User Manual (Optional)
DOWNLOAD ADDITIONAL DOCUMENTS
FOR US, AUSTRALIA, NEW ZEALAND AND
CANADA:
1. Go to BLACKBOX.COM
2. Enter the part number in the search box
(for example, SP385A-R3 or SP390A-R3).
3. Click on the product in the “Products” page.
4. Click on the “Support” tab on the product
page and select the document you wish to
download.
FOR OTHER COUNTRIES:
1. Go to BLACK-BOX.EU/SUPPORTCENTER
2. Enter the part number in the search box and
check the le type: application diagram, datasheet,
rmware or manual.
3. Select the document you want to download.

STEP X - Name of Step
COPYRIGHT 2018 BLACK BOX CORPORATION. ALL RIGHTS RESERVED.
SP385A-R3_SP390A-R3_QSG_REV1.PDF
Contact our free, 24/7 technical support in the US at 877-877-2269
or [e-mail]
For other countries, go to BLACKBOX.COM/CONTACT-US