Claims
- 1. In an elevator system having an elevator control for controlling an elevator car in a hoistway, a call registration and acknowledgement system, comprising:
- call registration means remote from the elevator control for transmitting a request signal to request elevator service;
- the elevator control inluding an input/output port and means for latching the port at a voltage level when a signal is coupled thereto, the latching means including a triac connected between the input/output port and ground potential having a gate electrode and means coupled to the gate electrode for generating a gating signal, the elevator control further including a resistor connected to the input/output port, a switch for selectively coupling the resistor to either first or second voltage levels, and means coupled to the switch and to the triac for operating the elevator control in a test mode to determine the operability of the elevator control and the call acknowledgement means;
- a single wire connecting the call registration means to the input/output port so that the port is latched at the voltage level when a request signal is developed; and
- call acknowledgement means remote from the elevator control connected to the single wire and actuable in response to the latching of the port to acknowledge a request for elevator service.
- 2. The system of claim 1, wherein the acknowledgement means is connected between the second voltage level and the single wire and wherein the test mode operating means includes means for controlling the switch to connect the resistor to the first voltage level, means coupled to the gating means for controlling same to cause a gating signal to be generated after the resistor has been connected to the first voltage level and means for checking the voltage at the input/output port when the gating signal is generated.
- 3. The system of claim 1, wherein the test mode operating means further includes a light-emitting diode connected in series between the gating means and the gate electrode of the triac which is energized when the gating signal causes the triac to conduct.
- 4. In an elevator system including an elevator control having a combined input/output port, call acknowledgement means connected between a first voltage and the input/output port, the input/output port being connected through a load resistor to a switch for selectively connecting the load resistor to the first voltage or to a second voltage, a triac connected between the input/output port and the second voltage having a gate electrode and means coupled to the gate for generating a gating signal to gate the triac, a method of testing the operability of certain components of the elevator system, comprising:
- (a) operating the switch to connect the load resistor to the second voltage;
- (b) operating the generating means to develop the gating signal; and
- (c) sensing the voltage at the input/output port to determine whether such voltage is close to the second voltage thereby indicating that the triac and generating means are operative.
- 5. The method of claim 4, including the further steps of: (d) removing the gate signal from the gate electrode; and (e) detecting the voltage at the input/output port to determine whether such voltage is at a level indicative of the operability of the triac and the call acknowledgement means.
- 6. The method of claim 4, wherein the elevator control system includes a plurality of call acknowledgement means connected to a plurality of input/output ports and including the further step of repeating steps (a)-(c) for each of the input/output ports and call acknowledgement means.
- 7. The method of claim 4, wherein the elevator control system includes a warning indicator and including the further step of energizing the warning indicator when the voltage at the input/output is not close to the second voltage while the gate signal is developed.
- 8. The method of claim 4, including the further step of storing an indication of a failure when the triac is found to be inoperative.
Parent Case Info
This is a continuation of application Ser. No. 567,560 filed Jan. 3, 1984 now abandoned.
US Referenced Citations (5)
Continuations (1)
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Number |
Date |
Country |
Parent |
567560 |
Jan 1984 |
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