Black Box RS-422 User manual

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CUSTOMER

SUPPORT

INFORMATION

JUNE 2000

SW421A-R2

SW422A-R2

RS-422 Code-Operated Switches

TEXT

TRANSPARENT

GRAPHICS

MODE

RESET ST LO

COS/4

RS-422 CODE-OPERATED SWITCHES

TRADEMARKS USED IN THIS MANUAL

DEC and VT100 are trademarks of Digital Equipment Corporation.

GW-Basic is a registered trademark of Microsoft Corporation.

HP is a registered trademark of Hewlett-Packard.

Wyse is a registered trademark of Wyse Technology.

Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

RS-422 CODE-OPERATED SWITCHES

1. Specifications

Data Rates — 300, 1200, 2400, 4800, 9600, 19,200, 38,400, 76,800 bps

Interface — RS-422/V.11, full duplex, asynchronous

RS-422 Circuits Supported

Pin # Description Pin # Description

12 Control in low 18 Data in high

13 Control in high 19 Data in low

14 Control out high 24 Data out high

15 Control out low 25 Data out low

Connectors — COS/4: (5) Female DB25 (master port and four subordinate ports); COS/8: (9)

Female DB25 (master port and eight subordinate ports); 5 to 8 bit, asynchronous

Indicators — LOCKOUT and SWITCH TIME LED indicators. Segment display for CHANNEL

SELECTED

Controls — External: Vertical switch (mode switch), pushbutton reset; Internal: Baud rate (300

to 76,800 bps) and format selectable; DTE/DCE configuration switch for each port

(non-functional); Auto Timeout (2.5 min., 5 min, 10 min., or infinite) switch-

selectable; Arming selectable, switch-selectable

Addressing — Two-digit code as follows: First digit is switch-selectable, initiates Switch Time—

factory setting is EOT (Ctrl D), (Hex 04), (Decimal 4). Second digit assigns

channel, Hex 30–37 selects port 0–7. Any channel can switch the channel when the

unit is in Switch Time (unless disabled by SW6 positions 1–4). The arming and

switching code is stripped by the Code-Operated Switch. The arming character can

pass as data in Graphics mode.

Enclosure — High-impact plastic

Operating Temperature — 32 to 122°F (0 to 50°C)

Storage Temperature — -4 to +158°F (-20 to +70°C)

Humidity Tolerance — 15 to 95%, noncondensing

Power — 115/230 VAC (switch-selectable), 60/50 Hz, 11 watts

Size — 12.3" x 11.8" x 2.5" (31.2 x 30 x 6.4 cm)

Weight — 8 lb. (3.6 kg)

RS-422 CODE-OPERATED SWITCHES

2. Introduction

2.1 Description

The Code-Operated Switch 422 (COS) is an asynchronous RS-422 switch. By sending codes to the master port, you

can select subordinate ports. The master device (CPU or terminal) selects any of the other ports (printers,

modems, or terminals, for example) by transmitting the proper arming and switching codes. The communications

link can also be made by any of the subordinate devices by transmitting their own channel address code while the

switch is in the Switch Time mode. Once the communications link is established, all other ports are locked out. The

ports remain locked out until either the master port or the selected subordinate port sends an arming character.

Reception of the arming character causes the COS to break all switched connections (leads 2, TD, and 3, RD,

control in and control out—user-selectable) between the master and subordinate port and puts the unit back in

Switch Time mode.

Signal ground (pin 7) is tied to chassis ground (pin 1) on each port. All ports have female DB25 connectors.

Configuration switches on all ports allow configuration to a DTE or DCE port. The devices also have switches to

select the baud rate and word format (parity, character length, and number of stop bits).

Figure 2-1 shows a network involving various peripherals. The computer (or terminal) selects which device it wishes

to communicate with by transmitting the proper arming and switching code (0 through 3 for the 4-port model, 0

through 7 for the 8-port model).

NOTE: Models with RS-232 ports are available as part numbers SW853A and SW854A. The COS can also be

specially ordered with some RS-422 and some RS-232 ports. These units are configured at the factory at the time the

order is placed. When you receive a specially ordered COS, make sure the configuration matches your order.

Figure 2-1. Typical Application.

Industrial Controller

Data Collection Panel

Serial Code-

Operated

Switch (4-Port)

Digital Analog Converter

Lathe

RS-422 CODE-OPERATED SWITCHES

2.2 Board Layout

*W5 on the COS/4 is the same as W1 on the COS/8.

Figure 2-2. Component Layout.

These switches are for COS-8 RS-232 only

W1 = COS/8*

SW5

115

SW4 SW3 SW2

SW1

SW6

SW9

SW7

SW10 SW8

LOCKSWT

40167B

RS-422 CODE-OPERATED SWITCHES

3. Installation

3.1 General

Installation of the COS is a matter of connecting the modem and terminal connectors to the proper

communications equipment using the interface connectors.

When viewing the COS from the rear, the leftmost connector is the Master connector. The channel connectors are

numbered from left to right 0, 1, 2, 3 (4, 5, 6, and 7 also for COS/8).

The COS directs data flow between the master port and whichever subordinate port that has been specified in the

command sequence.

Determine if any internal switches must be reconfigured to match your particular application. The unit’s internal

DIP switches are factory-preset to the following parameters:

Baud Rate: 9600 bps

Word Format: 8 data bits, 1 stop bit, and parity disabled

Auto Timeout: Disabled

Arming Character: 04 Hex (EOT), CTRL D

All Serial Ports: DCE with DSR, DTR Control

3.2 Switch Settings

CAUTION

If any internal DIP-switch settings must be changed, be certain that power is

disconnected from the unit before changing settings.

Refer to Figure 2-2 for the location of the switches. In the following switch descriptions, closed is abbreviated as C

and open is abbreviated as O.

3.2.1 SWITCH SW6

Switch Position

1 Open = Disables the slave’s ability to put the unit into switch time.

2 Open = Disables the master’s ability to put the unit into switch time.

3 Open = Disables the master’s ability to switch from switch time to channel.

4 Open = Disables the slave’s ability to switch from switch time to channel.

Close 5 Closed = 2.5-minute auto timeout.

only 6 Closed = 5-minute auto timeout.

one 7 Closed = 10-minute auto timeout.

8 Closed = Timeout is infinite.

{

RS-422 CODE-OPERATED SWITCHES

Figure 3-1. Port Configuration Switches.

Typical Switch Configuration for DCE Typical Switch Configuration for DTE

Switch A Close 6 and 7 Switch A Close 5 and 8

Switch B Close 1 and 4 Switch B Close 2 and 3

Note that positions 6, 7, and 8 on Switch B may be selected to assert RTS or CTS high or to tie RTS directly to CTS.

Switch 5 may be used to assert CD high.

RS-422 operates independently of port switch settings.

DTE is used if connecting to a terminal.

DCE is used if connecting to a modem.

CONTROL

OUT

DATA

OUT

CONTROL IN - 12

CONTROL IN + 13

CONTROL OUT + 14

CONTROL OUT - 15

DATA IN + 18

DATA IN - 19

DATA OUT + 24

DATA OUT - 25

SIGNAL PIN #

RS-422 PORT

DATA

OUT

PIN # SIGNAL

RS-232 PORT

2 TXD

3 RXD

SWITCH A

SWITCH B

6 DSR

20 DTR

7 SIG GND

1 FRAME GND

8CD

4 RTS

5 CTS

VCC

DATA

CONTROL

OUT

CONTROL

RS-422 CODE-OPERATED SWITCHES

3.2.2 SWITCH SW7

Switch Position

1 Open = Even Parity

1 Closed = Odd Parity

Position 2 Position 3 Word Length

Closed Closed 5 bits

Open Closed 6 bits

Closed Open 7 bits

Open Open 8 bits

4 Open = 2 stop bits

4 Closed = 1 stop bit

5 Open = Parity Disable

5 Closed = Parity Enable

6 Always Open

7 See graphics mode description, Section 4.6.3.

8 See graphics mode description, Section 4.6.3.

3.2.3 SWITCH SW8 ARMING CODE SETTINGS

EOT is the factory-default arming character.

ASCII codes 1 through 6 are the port address codes.

C = Closed (Off)

O = Open (On)

Arming Characters Arming Character Switch Positions

LSB MSB

ASCII CTRL Hex Decimal 1 2 3 4 5 6 7 8

NUL@00 0 CCCCCCCC

SOHA 01 1 OCCCCCCC

STXB 02 2 COCCCCCC

ETXC 03 3 OOCCCCCC

EOT D 04 4 C C O C C C C C

ENQ E 05 5 O C O C C C C C

ACK F 06 6 C O O C C C C C

BEL G 07 7 O O O C C C C C

BS H08 8 CCCOCCCC

HT I 09 9 OCCOCCCC

LF J 0A 10 C O C O C C C C

VT K 0B 11 O O C O C C C C

FF L 0C 12 C C O O C C C C

CR M 0D 13 O C O O C C C C

SO N 0E 14 C O O O C C C C

SI O 0F 15 O O O O C C C C

RS-422 CODE-OPERATED SWITCHES

Arming Characters Arming Character Switch Positions

LSB MSB

ASCII CTRL Hex Decimal 1 2 3 4 5 6 7 8

DLE P 10 16 C C C C O C C C

DC1 Q 11 17 O C C C O C C C

DC2 R 12 18 C O C C O C C C

DC3 S 13 19 O O C C O C C C

DC4 T 14 20 C C O C O C C C

NAK U 15 21 O C O C O C C C

SYN V 16 22 C O O C O C C C

ETB W 17 23 O O O C O C C C

CAN X 18 24 C C C O O C C C

EM Y 19 25 O C C O O C C C

SUB Z 1A 26 C O C O O C C C

ESC [ 1B 27 O O C O O C C C

FS \ 1C 28 C C O O O C C C

GS ] 1D 29 O C O O O C C C

RS ^ 1E 30 C O O O O C C C

US _ 1F 31 O O O O O C C C

SPACE 20 32 C C C C C O C C

!2133OCCCCOCC

"2234COCCCOCC

#2335OOCCCOCC

$2436CCOCCOCC

%2537OCOCCOCC

&2638COOCCOCC

'2739OOOCCOCC

(2840CCCOCOCC

)2941OCCOCOCC

.2A42COCOCOCC

+2B43OOCOCOCC

,2C44CCOOCOCC

-2D45OCOOCOCC

.2E46COOOCOCC

/2F47OOOOCOCC

03048CCCCOOCC

13149OCCCOOCC

23250COCCOOCC

33351OOCCOOCC

43452CCOCOOCC

53553OCOCOOCC

63654COOCOOCC

73755OOOCOOCC

83856CCCOOOCC

93957OCCOOOCC

:3A58COCOOOCC

;3B59OOCOOOCC

RS-422 CODE-OPERATED SWITCHES

Arming Characters Arming Character Switch Positions

LSB MSB

ASCII CTRL Hex Decimal 1 2 3 4 5 6 7 8

<3C60CCOOOOCC

=3D61OCOOOOCC

>3E62COOOOOCC

?3F63OOOOOOCC

@4064CCCCCCOC

A4165OCCCCCOC

B4266COCCCCOC

C4367OOCCCCOC

D4468CCOCCCOC

E4569OCOCCCOC

F4670COOCCCOC

G4771OOOCCCOC

H4872CCCOCCOC

I4973OCCOCCOC

J4A74COCOCCOC

K4B75OOCOCCOC

L4C76CCOOCCOC

M4D77OCOOCCOC

N4E78COOOCCOC

O4F79OOOOCCOC

P5080CCCCOCOC

Q5181OCCCOCOC

R5282COCCOCOC

S5383OOCCOCOC

T5484CCOCOCOC

U5585OCOCOCOC

V5686COOCOCOC

W5787OOOCOCOC

X5888CCCOOCOC

Y5989OCCOOCOC

Z5A90COCOOCOC

[5B91OOCOOCOC

5C 92 C C O O O C O C

]5D93OCOOOCOC

5E94 COOOOCOC

¨5F95OOOOOCOC

-6096CCCCCOOC

a6197OCCCCOOC

b6298COCCCOOC

c6399OOCCCOOC

d 64 100 C C O C C O O C

e 65 101 O C O C C O O C

f 66 102 C O O C C O O C

g 67 103 O O O C C O O C

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