FEBRUARY 1998
IC477A-M-R2
IC478A-F-R2
IC476A-F-R2
IC476A-M-R2
IC477A-F-R2
IC478A-M-R2
Async 232↔422/485 Converter
IC477A-M-↔R4285
Async 232
Code:
Converter
Item:
S/N:
Code:
Item:
S/N:
485
↔
IC476A-M-R2
Async 232
Code:
Converter
Item:
S/N:
CUSTOMER Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
SUPPORT
INFORMATION
Web site: www.blackbox.com
•
E-mail: info@blackbox.com
ASYNC 232↔422/485 CONVERTER
NORMAS OFICIALES MEXICANAS (NOM)
ELECTRICAL SAFETY STATEMENT
INSTRUCCIONES DE SEGURIDAD
.
2
ASYNC 232↔422/485 CONVERTER
3
ASYNC 232↔422/485 CONVERTER
Contents
4
CHAPTER 1: Specifications
1. Specifications
Data Rate
Connectors
Transmission Format
Transmission Line
Transmission Mode
Range
Control Signals
Carrier
Surge Protection
RTS/CTS Delay
MTBF
Operating Temperature
5
ASYNC 232↔422/485 CONVERTER
Humidity
Altitude
Power
Size
Shipping Weight
6
CHAPTER 2: Introduction
2. Introduction
↔
Section 4.4
7
ASYNC 232↔422/485 CONVERTER
3. Configuration
↔
DTE/DCE Switch
DCE
DTE
Terminal Block
+RCV-G-XMT+
8
CHAPTER 3: Configuration
DIP Switch S1
ON
1
2
3
4
5
6
7
8
3.1 Setting the DTE/DCE Switch
9
ASYNC 232↔422/485 CONVERTER
3.2 DIP-Switch Configuration
internally
ON
ON
1 2 3 4 5 6 7 8
OFF
10
CHAPTER 3: Configuration
3.2.1 DIP-SWITCH SETTINGS
Switch S1 Summary Table
Position
S1-1*
S1-2*
S1-3
Function
“Transmit Off” Impedance
“Transmit Off” Impedance
RTS/CTS Delay
Echo Mode
Factory Default
Off
High Z
Off
On
Off
On
On
On
On
8 msec.
S1-4
Echo Off
S1-5
Carrier Control
Controlled by RTS
120 ohm
S1-6
Receive Impedance
2 wire/4 wire
S1-7*
S1-8*
2-wire
2 wire/4 wire
*Note: Switches S1-1 and S1-2 should be switched simultaneously.
Switches S1-7 and S1-8 should also be switched simultaneously.
S1-1 and S1-2: “Transmit Off” Impedance
S1-3: RTS/CTS Delay
11
ASYNC 232↔422/485 CONVERTER
S1-4: Echo Mode
S1-5: Carrier-Control Method
NOTE
Carrier is ON when RTS is asserted positive, and OFF only when RTS is
driven to a negative voltage.
S1-6: Receive Impedance (Termination)
S1-7 and S1-8: 2-wire/4-wire Modes
12
CHAPTER 3: Configuration
3.2.2 CONFIGURATION SWITCH APPLICATIONS
Do not change switch settings until you have carefully read
this manual.
Typical Switch Applications
Switch Settings
Point-to-Point
Multipoint
4W
Off
Off
On
Off
Off
4W HDX
Off
2W
Off
Off
On
Off
On
4W
Off
Off
Off
Off
2W
Off
Off
On
Off
On
“Xmt Off” Imp. (S1-1)
“Xmt Off” Imp. (S1-2)
RTS/CTS Delay (S1-3)
Echo (S1-4)
Off
On
Off
Carrier Control (S1-5)
On
Master—Off
Slaves—On
Rcv. Impedance (S1-6)
On
On
On
Master—On
Slaves—Off
Last Slave—On
On
2-wire/4-wire (S1-7)
2-wire/4-wire (S1-8)
Off
Off
Off
Off
On
On
Off
Off
On
3.2.3 WHEN YOU’RE FINISHED CONFIGURING
don’t
Section 4.1.2
13
ASYNC 232↔422/485 CONVERTER
4. Installation
4.1 Connection to the RS-485 Interface
must
4.1.1 4-WIRE CONNECTION USING THE DB25 (IC477A-X-R2 AND IC478A-X-R2)
Converter
Signal DB25 Pin
RS-485 (530) Device
DB25 Pin
Signal
RCVA
RCVB
XMTA
2......................................3
XMTB
14....................................16
RCVA
RCVB
3......................................2
16....................................14
XMTA
XMTB
NOTES
1) In the pinout above “A” means positive and “B” means negative.
14
CHAPTER 4: Installation
2) It is not necessary that the RS-485 device adhere to the RS-530
standard. However, you must make sure that the signals, polarities, and
pairing of your connection conform to this table.
3) If you are not using two IC477A-X-R2s or IC478A-X-R2s back to back
and the procedure on the previous page produces garbage data (or none
at all), flip the “A” and “B” leads at one end of the 485 connection.
4.1.2 4-WIRE CONNECTION USING TERMINAL BLOCKS (IC476A-X-R2)
1.
Section 3.2
2.
3.
4.
one pair of wires
15
ASYNC 232↔422/485 CONVERTER
5.
the other pair of wires
NOTE
Positive and negative are relative terms and may not always have the
same relationship for all RS-422 or RS-485 devices (see the previous
note regarding “flipping the leads”).
Converter
RS-485 Device
XMT+ ............................................................RCVA
XMT- .............................................................RCVB
G .....................To Shield (Optional)
G
RCV- .............................................................XMTB
RCV+ ............................................................XMTA
IMPORTANT!
If you are not using two IC476A-X-R2s back to back and the procedure on
the previous page produces garbage data (or none at all), flip the “A” and
“B” leads at one end of the 485 connection.
6.
A ground wire is not necessary
for proper operation of the Converter.
7.
16
CHAPTER 4: Installation
8.
9.
17
ASYNC 232↔422/485 CONVERTER
10.
11.
4.1.3 2-WIRE CONNECTION
only the transmit (XMT) pair
Converter Signal
RS-485 Signal
XMT+..................................+ (positive)
XMT-...................................- (negative)
IMPORTANT!
If you are not using two IC476A-X-R2s back to back and the procedure on
the previous page produces garbage data (or none at all), flip the “A” and
“B” leads at one end of the 485 connection.
18
CHAPTER 4: Installation
4.2 Connection to the RS-232 Interface
NOTE
If you must use a cable to connect the Converter to the RS-232 device,
make sure it is a straight-through cable of the shortest possible length.
We recommend no more than 6 ft. (1.8 m).
4.3 Wiring for Multipoint Applications
XMT A
XMT B
RCV A
RCV B
XMT B
RCV A
RCV B
XMT B
RCV B
RCV A
XMT A
RCV B
RCV A
XMT A
MASTER
SLAVE 1
SLAVE 2
SLAVE 3
SLAVE N
XMT A
XMT A
XMT B
XMT B
RCV B
RCV A
NOTE
Connections are to screw terminals directly on the Converter.
19
ASYNC 232↔422/485 CONVERTER
4.4 Operation
data
20
APPENDIX A: RS-232C Pin Configurations
Appendix A. RS-232C
Pin Configurations
DIRECTION
STANDARD “DCE” SETTING
DIRECTION
1- (FG) Frame Ground
2- (TD) Transmit Data
3- RD) Receive Data
To Converter
FromConverter
To Converter
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
FromConverter
FromConverter
To Converter
Data Term. Ready (DTR) - 20
8- (DCD) Data Carrier Detect
From Converter
DIRECTION
STANDARD “DTE” SETTING
DIRECTION
1- (FG) Frame Ground
2- (TD) Transmit Data
3- RD) Receive Data
From Converter
To Converter
From Converter
To Converter
To Converter
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect
From Converter
Data Term. Ready (DTR) - 20
To Converter
21
ASYNC 232↔422/485 CONVERTER
Appendix B. 422/485 (530)
Pin Configuration
Pin Number
Pin Name
22
APPENDIX C: Self-Test
Appendix C. Self-Test
Section 3.2.2
23
© Copyright 1998. Black Box Corporation. All rights reserved.
1000 Park Drive
•
Lawrence, PA 15055-1018
•
724-746-5500
•
Fax 724-746-0746
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