485DSS3298 Manual
Table of Contents
i
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
TABLE OF CONTENTS
CHAPTER 1: HARDWARE ...................................................................1
I
NTRODUCTION
.........................................................................................1
Figure 1. Example of an RS-485/422 Multi-Node Network.......................1
C
HECKLIST
...............................................................................................1
S
PECIFICATIONS
........................................................................................2
Figure 2. Top View of Circuit Board...........................................................2
P
ORT
C
ONFIGURATION
..............................................................................2
RS-485/422 Port ..................................................................................2
Table 1. RS-422/485 Port ......................................................................3
RS-232 Port .........................................................................................3
Table 2. RS-232 DTE DB25P Connector Chart.....................................4
RS-422/485 Wiring ..............................................................................4
2-Wire Mode ........................................................................................4
Table 3. Component Values For Send Data Timing...............................5
Figure 3. RS-485 Wiring Diagram .............................................................6
4-Wire Mode ........................................................................................6
Figure 4. RS-422 Wiring Diagram .............................................................7
RS-485
AND
RS-422 T
ERMINATION
.........................................................7
P
OWER
S
UPPLY
.........................................................................................7
O
PERATION
...............................................................................................8
Figure 5. Simplified Functional Diagram ...................................................9
C
OMMUNICATION
C
ONFIGURATION
..........................................................9
D
ISTRIBUTED
S
MART
S
WITCH
C
OMMANDS
...............................................9
The Command String .........................................................................10
ON Command ....................................................................................10
OFF Command ..................................................................................11
STATUS REQUEST Command..........................................................11
S
ETTING THE
485DSS A
DDRESS
.............................................................14
Table 4. Address Switch.......................................................................14
B
INARY
F
ILE
T
RANSFER
.........................................................................15
CHAPTER 2:
SOFTWARE
...................................................................16
D
ESCRIPTION
.........................................................................................16
H
ARD
D
RIVE
I
NSTALLATION
...................................................................16
R
UNNING
D
EMONSTRATION
P
ROGRAM
.................................................17
APPENDIX A: ASCII CHARACTER CODES .................................A-1
APPENDIX B: DECIMAL/HEXADECIMAL CONVERSIONS......B-1
Table 5. Hex/Dec Conversions ................................................................B-1
ii
Table of Contents
485DSS3298 Manual
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
APPENDIX C: CABLE CHARTS ......................................................C-1
C
HART
1. IBM PC DB25 C
ONNECTOR TO
..........................................C-1
485DSS RS-232 (DTE) P
ORT
...........................................................C-1
C
HART
3. RS-232 DCE D
EVICE W
/DB25 C
ONNECTOR TO
..................C-1
485DSS RS-232 (DTE) P
ORT
...........................................................C-1
C
HART
2. IBM PC DB9 C
ONNECTOR TO
............................................C-1
485DSS RS-232 (DTE) P
ORT
...........................................................C-1
C
HART
4. RS-232 DCE D
EVICE W
/DB9 C
ONNECTOR TO
....................C-2
485DSS RS-232 (DTE) P
ORT
...........................................................C-2
C
HART
5. RS-422/485 4-W
IRE
D
EVICE TO
485DSS RS-422/485P
ORT
C-2
C
HART
6. RS-485 2-W
IRE
D
EVICE TO
485DSS RS-485/422 P
ORT
. ....C-2
485DSS3298 Manual
1
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Chapter 1: HARDWARE
Introduction
The RS-485 Distributed Smart Switch (485DSS) connects one
RS-232 device to an RS-485 multi-node network as shown in Figure
1. To accomplish this, the 485DSS converts RS-232 to an
addressable RS-485 node. A unique address, from 0 to 255, is user
assigned by setting switches on the 485DSS.
Checklist
The following items should be in the shipping carton:
1. RS-485 Distributed Smart Switch
2. Instruction Manual
3. (1) 3 1/2" floppy disk
Contact the shippers immediately if any of the items above is
missing or has damage.
Figure 1. Example of an RS-485/422 Multi-Node Network
2
485DSS3298 Manual
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Specifications
Model:
485DSS
Size:
4.8"L x 2.15"W x 0.9"H
Power:
+11 to 16 Vdc 75mA
RS-232 Connection: DB-25 male (DTE configured)
RS-485 Connection: Terminal Blocks
Communications:
9600 baud, no parity, 8 data bits, 1 stop bit
Figure 2. Top View of Circuit Board
Port Configuration
The 485DSS has a RS-485/422 port and a RS-232 port. The
RS-485/422 signals are on terminal blocks. Table 1 shows you the
pinouts and Figure 2 shows you the location of the terminal blocks.
The RS-232 signal, in the DTE configuration, connects to a DB25
male connector. Table 2 shows you the RS-232 pinouts.
RS-485/422 Port
The RS-485 port on the 485DSS receives and transmits data to
and from the RS-485 network. The RS-485 port has a balanced
differential line driver and receiver. RS-485 allows up to 32 driver
and receiver pairs to share a two-wire party line network. This port
will operate on a 4-wire network and is compatible with RS-422
devices. Refer to B&B Electronics' free RS-422/485 Application Note
for more information. Refer to Appendix C for cable charts.
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