Hal Communications ST-6000, Instruction Manual

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3-10
3.2.6 Separate Keyboard Connection
The black wire and shield from the KOS cable can be connected to a separate keyboard circuit
that switches to ground (such as the DKB-2010). The switch element should either be an NPN
transistor (switching to ground) or "dry" contacts (keyboard contacts isolated from any voltage or
current sources). Since the standard connection of the teleprinter and DKB-2010 is in the series
current loop (LOOP 1), this connection will not generally be used. However, when the separate
keyboard connection is used, operation of the keyboard will also operate the KOS circuit.
3.2.7 RS-232C Cable Connection
Two factory prepared cables are attached to a 6 pin connector that mates with the RS-232/MIL-
188 rear panel connector. One of these cables is labeled "RS-232". This cable can be used to drive
the "VOLTAGE" or "EIA" or "RS-232" inputs of the RVD-1002, RVD-1005 or DS-3000 KSR solid-
state equipment. The white wire of the RS-232 cable is the RS-232 data output and the black wire
is for input of RS-232 data to the tone keyer as connected by the AUXILIARY jumper plug. The
white wire and shield should be connected to the VOLTAGE or EIA/RS-232 input of the units. In
addition, the black wire may be connected to the RS-232 data output connection of the DS-3000
KSR. Typical connections to the RS-232 cable are shown in Figure 3.3. Refer to page 3-? before us-
ing RS-232 I/O connections.
3.2.8 CW-ID Key Cable Connection
A second cable from the RS-232/lMIL-188 connector is labeled "CW-ID". This cable should be
connected to the station Morse code hand key or electronic keyer to provide narrow-shift CW iden-
tification of the transmitted signal. When an electronic keyer is used, the output circuit for cathode
keying should be used, instead of the grid-block keying circuit. In no case should the keyer reflect
any negative voltage or positive voltages greater than +12 to the ST-6000.
3.2.9 AC Power Cord Connection
The ST-6000 can be internally connected to operate from power sources in two voltage ranges:
105 to 125 VAC or 210 to 250 VAC, 50 or 60 Hz. The rear panel power cord connector is of the
"universal" USA/European type and mating power cords can be obtained for most common wall
connectors. The ST-6000 is normally factory wired for operation from 105 to 125 VAC, 50 to 60 Hz
power lines. Upon request at the time of the order, the ST-6000 can also be supplied for 210 to
250 VAC, 50 to 60 Hz operation. When the 210 to 250 VAC connection is supplied, it is indicated
by a small tag on the rear panel of the ST-6000. If this tag is NOT on the rear panel, do NOT con-
nect the ST-6000 to a 240 Volt line without first checking the internal wiring of the power trans-
former. Particular attention should be given to the precautionary notes of section 3.2.4 when con-
necting to the MOTOR receptacle.
The proper power transformer primary connections are:
105 to 125 VAC, 50/60 Hz: jumper terminal 1 to 3 & 2 to 4, connect power line to terminals 1 & 4.
210 to 250 VAC, 50/60 Hz: jumper terminal 3 to 2, connect power line to terminals 1 and 4.
These connections are shown in Figure 5.13.
3.2.10 Ground Connection
The ST-6000 cabinet should ALWAYS be connected to an adequate ground system. A three-
prong grounding type AC power plug is furnished for connection to a grounded-outlet power sys-
tem (105–125 VAC connection). If the wiring of the building is correct, use of the grounding AC
plug should provide an adequate SAFETY ground return for the instrument. However, it is a good