Hal Communications ST-6000, Инструкция по эксплуатации

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3-7
3.2.5 KOS Cable Connection
The wires from the KOS cable can be connected to the transmitter push-to-talk (PTT) control
line for automatic transmit-receive control of the station. The jumpers on the factory-supplied AUX-
ILIARY jumper plug allow operation of the KOS circuit when the keyboard and printer sections of
the teleprinter are series connected to LOOP 1 (or LOOP 3). A complete discussion of the operation
of the KOS-circuit is found in section 4.9. Alternate KOS circuit connections are also discussed in a
later section. The following precautions should be observed when using the KOS cable:
1. The KOS switching transistor in the ST-6000 is an NPN transistor. The transmitter push-to-
talk (PTT) line should have a positive voltage with respect to ground in receive condition.
2. Shunting the PTT line to ground should place the station in transmit mode.
3. The voltage of the PTT circuit should not 25 Volts (receive).
4. The current drawn through the KOS transistor in transmit mode should not exceed 500 mA.
5. If negative or AC voltages are to be controlled by the KOS circuit, a DC relay should be
used to isolate the KOS and PTT circuits.
6. The KOS connection is to the white wire (+) and the shield wire (ground).
NOTES ON THE USE OF ST-6000 RS-232 I/O CONNECTIONS
1. Modify the standard Auxiliary Jumper Plug circuit board by adding a wire jumper between
Pin 13 (Transmit Loop Drive) and Pin 14 (Local Data Out).
2. Using the pins and connector shells provided, make a new jumper plug for the Loop 1 & 2
connector (J8). Connect a wire jumper between pin 1 (Loop High) and pin 4 (Loop Low);
connect a second wire jumper between pin 3 (Keyboard Data In) and pin 5 (Ground). Use a
six pin female shell and male pins.
3. Plug-in the standard Loop 3 jumper plug furnished.
4. Use the standard RS-232 I/O cable to connect to the terminal or machine.
The ST-6000 and terminal will now operate in the half-duplex mode using RS-232 I/O interface
connections. The RS-232 data from the terminal will both drive the ST-6000 Loop 1 circuit and op-
erate the KOS circuitry. A teleprinter connected into the Loop 1 circuit will print data generated on
the RS-232 terminal or data demodulated by the ST-6000. A keyboard can be connected in the
Loop 1 circuit, if desired.
RS-232 Full-duplex operation with the ST-6000:
The following steps should help clarify use of the RS-232 Input/Output connections for full-du-
plex operation with the ST-6000:
1. Refer to Figure 3.6 and modify the Auxiliary Jumper Plug circuit board as shown, removing
the circuit board jumpers between pins 1 and 5 and between pins 11 and 15; add a wire
jumper between pins 14 and 15.
2. Using the pins and connector shells provided, make a new jumper plug for the Loop 1 & 2
connector (J8). Connect a wire jumper between pins 1 and 4 and a second wire jumper be-
tween pins 3 and 5 of the plug. Use a six pin male shell and female pins.
3. Plug-in the standard Loop 3 jumper plug furnished.
4. Use the standard RS-232 I/O cable (as modified above) to connect to the terminal or ma-
chine.
5. Use the front panel switch to turn the KOS circuit OFF.
A printer may again be inserted in the Loop 1 circuit but will now print ONLY received data and not
data originating from the RS-232 terminal.