Control up to eight serial devices—
RS-232 or RS-422—from your PC.
Control up to eight serial devices—
RS-232 or RS-422—from your PC.
RS-232 and RS-422 Code-Operated Switches
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FEA TURES
• Support speeds to 76.8 kbps!
• Keep your connection safe—once a
connection is made, other ports are
locked out.
• DTE/DCE-selectable, so you can switch
between a modem and a printer.
• Safe for use with laser printers.
• Includes a hardware-handshake lead
in each direction for added control.
T ypical application.
OVERVIEW
The BLACK BOX®Code-Operated Switch (RS-232 or RS-422)
enables you to switch your serial devices with codes.
There’s no unintended triggering either—no matter what
data you’re sending. With an internal DIP switch, you select
the arming character to use as a trigger.
You can set each port individually as DTE or DCE. That’s
handy for switching among modems and printers. And your
connection is secure. Once a connection is made, other ports
are locked out. Remember that all ports need to be set to
operate with identical speeds and word structures.
For extra control, there’s a hardware-handshake lead in
each direction in case a device (or the computer) needs it.
Code-Operated Switch
(SW853A-R2)
PC
Serial Printer
UNIX
®
Host
CNC Lathe
Scale
Code-operated switches
BLACK BOX®Code-Operated Switches enable one device to
control up to 64 connected devices, depending on the codeoperated switch. For instance, you can use one modem—not
eight—to control eight devices. Code-operated switches are
ideal for applications that require remote switching for file
sharing or monitoring. Use code-operated switches for:
• Remote programming. Call in via remote sites to access
servers, logic controllers, or any devices that require
programming.
• Diagnostics. From your master control room, you can
probe servers and run diagnostics.
Technically Speaking
TECH SPECS
Data Format — 5 to 8 bits
Speed — 300 bps to 76.8 kbps
Switches — Text/T ransparent/Graphics Mode; Reset
CE Approval — Yes
Interface — SW853A-R2–SW854A-R2: RS-232 async;
SW421A-R2: RS-422 async
Connectors — SW853A-R2, SW421A-R2: (5) DB25 female;
SW854A-R2: (9) DB25 female; DCE/DTE switch-selectable
Indicators — (1) 7-segment channel-selected display, (2) lockout
and switch time LEDs
Power — 115/230 VAC, 60/50 Hz, 11 watts (switch-selectable)
Size — 3"H x 12.8"W x 11.3"D (7.6 x 32.5 x 28.7 cm)
Weight — 8 lb. (3.6 kg)
Item Code
Code-Operated Switches
RS-232
4-Port SW853A-R2
8-Port SW854A-R2
RS-422
4-Port SW421A-R2
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