B&B Electronics Port Expander 232PE Manuale utente
232PE3095 Manual Cover Page
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Port Expander
Model 232PE
Document No. 232PE3095
This product
Designed and Manufactured
In Ottawa, Illinois
USA
of domestic and imported parts by
B&B Electronics Mfg. Co. Inc.
707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Internet:
http://www.bb-elec.com
1993 B&B Electronics -- June 1993
232PE3095 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
Introduction.........................................................................1
Checklist.............................................................................2
Port Expansion Bus.............................................................2
Setting The Address............................................................2
Connecting To The Bus.......................................................4
Port Configuration...............................................................5
RS-232 Configuration.......................................................5
RS-422/485 Option ..........................................................6
RS-422 Mode................................................................7
RS-485 Mode................................................................8
Specifications....................................................................10
Appendix A: Cable Charts ...........................................A-1
Chart 1. IBM PC DB25 Connector to Master Port...........A-2
Chart 2. IBM PC DB9 Connector to Master Port.............A-2
Chart 3. Modem DB25 Connector to Master Port............A-3
Chart 4. DCE Device w/DB25 Connector to Ports A - D
(DTE)....................................................................A-3
Chart 5. IBM PC DB25 Connector to Ports A - D (DTE)..A-4
Chart 6. IBM PC DB9 Connector to Ports A - D (DTE)....A-4
Chart 7. IBM PC DB25 Connector to Ports A - D (DTE)..A-5
Chart 8. IBM PC DB9 Connector to Ports A - D(DTE).....A-5
Chart 9. RS-422/485 4-Wire Device to Port (A - D)
Configured as an RS-422 /485 Port.......................A-6
Chart 10. RS-422/485 2-Wire Device to Port (A - D)
Configured as an RS-422 /485 Port.......................A-6
ii Table of Contents 232PE3095 Manual
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
232PE3095 Manual 1
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Chapter 1: HARDWARE
Introduction
The Port Expander (232PE) adds four asynchronous serial data
ports to the Expandable Smart Switch (232XSS). Up to fifteen Port
Expanders can be connected to a single 232XSS via the Port
Expansion Bus. Refer to Figure 1. This expands the eight ports on
the 232XSS to a maximum of sixty-eight ports. RS-232 ports are
standard on the 232PE, RS-422/485 ports are optional. RS-232
ports are configured as DTE ports and support signals TD, RD,
RTS, CTS, DTR, and DSR or CD. Ports configured as RS-422/485
support only signals TD and RD.
There are five red indicator LED's on the front of the 232XSS.
Four LED's represent ports "A" through "D" and indicate the
selected port. The fifth LED is the "Power On" indicator. Refer to
Figure 7. There are five connectors located on the back of the
232PE, a twenty pin expansion bus connector, four DB-25P male
connectors for ports "A" through "D", and an eleven inch bus
expansion ribbon cable. Refer to Figure 8.
In order to select a port on a Port Expander, each expander is
assigned its own unique address. A four position DIP switch in the
Port Expander is used to set this address. An address field is part
of the port selection control string that is received by the master
port of the Expandable Smart Switch. Refer to the Expandable
Smart Switch manual for more details regarding port selection.
There is no delay through the Port Expander and the data is not
buffered.
Figure 1. Simplified Functional Diagram
This diagram illustrates only the transmit data (TD) signal.
2232PE3095 Manual
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Checklist
The following equipment should be in the shipping carton:
1. Port Expander
2. Instruction Manual
If any of the items above are damaged or missing contact the
shipper immediately.
Port Expansion Bus
The number of serial ports on the Expandable Smart
Switch can easily be expanded to a maximum of sixty-eight ports
by daisy chaining Port Expander units on the 232XSS's expansion
bus. A maximum of fifteen Port Expander units can be added to a
232XSS. Each Port Expander unit (232PE) adds four additional
serial ports. The Port Expansion Bus connects each port to the
electronic switch control circuit in the 232XSS.
Setting The Address
Port Expanders must be assigned their own unique address.
Located inside the 232PE is a four position DIP switch (SW1) which
sets the unit's address. Refer to Figure 2. Select an unused
address from "1" to "15" using Table 1.
CAUTION: Always power down the 232PE before removing its
cover.
Do not select an address that is used by another Port
Expander, data collisions can occur and data will be
lost!
232PE3095 Manual 3
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Figure 2. Printed Circuit Board Outline
* PC board for optional RS-422/485 port.
4232PE3095 Manual
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Connecting To The Bus
Connecting the Port Expander to the Expandable Smart Switch
bus is a simple task. On the rear panel of the Port Expander is an
expansion bus cable, refer to Figure 3. This cable simply plugs into
the bus expansion connector located on the back of the last unit
connected to the Expandable Smart Switch bus.
Table 1. Address Switch
DIP Switch 1
1 2 3 4 Address
0000 Invalid
1000 1
0100 2
1100 3
0010 4
1010 5
0110 6
1110 7
0001 8
1001 9
0 1 0 1 10
1 1 0 1 11
0 0 1 1 12
1 0 1 1 13
0 1 1 1 14
1111 15*
1 = OFF 0 = ON
* = FACTORY DEFAULT
Figure 3. Bus Connection Diagram
232PE3095 Manual 5
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Port Configuration
The 232PE has four selectable ports labeled "A" through "D".
Refer to Figure 8. Any of the ports can be manufactured to meet
either RS-232 or RS-422/485 electrical characteristics.
RS-232 Configuration
RS-232 ports will be wired as DTE ports. Refer to Table 2 for
pin out, signal name, and signal direction information. Also, refer to
Figure 4 for a simplified schematic showing the relationship
between the master port of the 232XSS and any RS-232 port of the
232PE. Refer to Appendix B for cable charts.
Table 2. RS-232 DTE PORTS A - D
Pin # Signal Description
RS-232 Signal
Direction of
DTE Ports A
through D
2TD Transmit Data Output
3RD Receive Data Input
4RTS Request to Send Output
5CTS Clear to Send Input
6*DSR Data Set Ready Input
7SG Signal Ground <------>
8* CD Carrier Detect Input
20 DTR Data Term Ready Output
* Pins 6 & 8 are tied together inside the 232PE and
share the same input, refer to Figure 4.
6232PE3095 Manual
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
RS-422/485 Option
The RS-232 transmit and receive data signals on the master
port of the 232XSS will be converted to balanced full-duplex RS-
422 or half-duplex RS-485 signals with this option.
Figure 4. Simplified RS-232 Schematic
Table 3. RS-422/485 PORTS A - D
Pin # Signal Description
RS-422/485
Signal Direction
of Ports A - D
2TD(A) Transmit Data (A) Output
14 TD(B) Transmit Data (B) Output
7SG Signal Ground <------>
3RD(A) Receive Data (A) Input
16 RD(B) Receive Data (B) Input
Indice
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