Located on the back or rear of the product you will find an IEC Power receptacle. The
supplied power cord plugs into this receptacle. This receptacle also contains a fuse
drawer. Two (2) fuses are located in this compartment. For 110 VAC +/- 10%
operation the unit is equipped with slow blow 160ma Fuses, Part # 714000. For 220
VAC +/- 10% operation the unit is equipped with slow blow 80ma Fuses, Part # 714001.
Additionally, you will find the Master Port and four sub-channel female DB-25
connectors.
2.3 ASYNC DATA RATES / CHARACTER
The MSD-4C has an internal Dip Switch to on the PCB to set data rates from the
internal baud rate switch located at
SW-4
. The unit supports
ASYNC
data rates in a
range from 1.2k up to 115.2k. The ASYNC character length is set at 8, N, 1 or 10 bit
data.
2.4 RS-232 ASYNC ELECTRICAL INTERFACE
The MSD-4C is EIA RS-232 (CCITT V.24) compliant using female DB-25 connectors.
All five RS-232 ports are configured as DCE(modem type) interfaces and connect to
A
Green
LED illuminates when AC Power has been applied and is marked
PWR
. Six
adjacent
Green
LEDs marked
TXD, RXD, RTS, CTS, DTR, DCD
illuminate in union
with the Master port
control signal
activity. Four adjacent green LED’s provide the user
with the active RS-232 sub-channel. Additionally, four yellow LEDs are provided to
provide the user with a visual indication of a streaming sub-channel(if enabled).
Positive latching switches are provided for each sub-channel port for isolating or
removing a sub-channel. Each sub-channel DTE port has its own switch and operates
independently. To disable a sub-channel simply push the switch. A channel is disabled
when the switch is in the
outer most position
.
2.2 REAR PANEL CONNECTORS AND FUSES
CHAPTER 2 - PRODUCT OVERVIEW
2.1 FRONT PANEL INDICATORS AND SWITCHES
1.2 THEORY OF OPERATION
A switch with a combination of input and output ports, the connections between which
can be remotely reconfigured by commands entered into a computer. Code-operated
switches are useful in environments where remote switching is needed for file-sharing
or monitoring purposes.
MSD-4C INSTALLATION AND OPERATIONS MANUAL
Page 2
