2
Compliance:
FCC Part 15 Subpart B
Class B, IC Class/classe B
Interface:
SW490A, SW492A: EIA/TIA
RS-232 serial, DCE on
numbered ports and DTE on
lettered ports;
SW491A, SW493A: Bidirectional
IEEE 1284 parallel, including
Compatibility (IBM PC parallel
compatible), Nibble/Byte, ECP,
and EPP modes
Serial Characteristics:
SW490A, SW492A: Transparent
to synchronous or
asynchronous protocol,
synchronous clocking, data
format, flow control, and full-
or half-duplex operation
Data Rate:
Serial: Transparent to data rates
up to 230 kbps;
Parallel: Transparent to any data
rate sustainable by the
attached devices
Maximum Distance:
SW490A, SW492A: 50 ft. (15.2 m)
to any attached device;
SW491A, SW493A: 20 ft. (6.1 m) to
any attached device
User Controls:
All top-mounted:
SW490A, SW491A: (1) Four-key
membrane touchpad, one key
for each numbered (computer)
port;
SW492A, SW493A: (2) Four-key
membrane touchpads, one
key for each numbered
(computer) port
Indicators:
Visible:
(1) Front-mounted green LED
for power;
(1) Top-mounted red LED for
each combination of
lettered and numbered
(computer) ports:
SW490A, SW491A:
(16) arranged in a 4 x 4
matrix;
SW492A, SW493A:
(32) arranged in a 4 x 8
matrix;
Audible:
One-second tone to indicate
successful power-up;
Short beep to indicate that a
port has been switched
Connectors:
All rear-mounted:
(1) Barrel jack for power;
Numbered ports:
SW490A: (4) DB25 female;
SW491A: (4) DB25 male;
SW492A: (8) DB25 female;
SW493A: (8) DB25 male;
Lettered ports:
SW490A, SW492A:
(4) DB25 male;
SW491A, SW493A:
(4) DB25 female
Leads/Signals Supported:
SW490A, SW492A: Pin 7 (SGND)
held common; Pins 2 through
6, 8, 15, 17, 19, 22, and 24 (TD,
RD, RTS, CTS, CD, TC, RC,
SRTS, DTR, RI, and EXTC)
switched; note that on Switch
ports Pin 24 (EXTC) is a DCE
output and a DTE input;
SW491A, SW493A: All grounds
(Pins 18 through 25) held
common, all data and control
signals (Pins 1 through 17)
switched
Power:
From utility-power (mains)
outlet, through wallmount
transformer and detachable
output cord, to rear-mounted
barrel jack:
Input: 115 VAC, 60 Hz;
Output: 12 VDC at up to
300 mA;
Consumption: 3.6 watts maximum
Temperature Tolerance:
32 to 122˚F (0 to 50˚C)
Humidity Tolerance:
40 to 90% noncondensing
Size:
3.3"H x 12.2"W x 8.3"D
(8.3 x 30.8 x 21 cm)
Weight:
SW490A: 3.9 lb. (1.8 kg);
SW491A: 3.8 lb. (1.7 kg);
SW492A: 4.4 lb. (2 kg);
SW493A: 4.2 lb. (1.9 kg)
A
B
C
D
PORT
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• • • •
• • • •
• • • •
5
6
7
8
D
E
V
I
C
E
PORT
4x4 Manual
Matrix Switch
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• • • •
1
2
3
4
Serial
printers
BC00901
cables
4 x 8 Serial
Manual Matrix
Switch
EVMBMC
cables
PCs with DB9 serial ports
PCs with DB25 serial ports
EVMBSM
cables
EVMBSM
cables
lettered ports
numbered ports
Modems
Specifications
Just run your cables,
plug in the Switch,
and start connecting
users to resources
with the press of a
button.
