Rane HAL1x Installation Guide - Page 77

What are other differences between Momentary and Latching settings for a Logic In toggle?

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CHAPTER 2: Hardware Component Details What are other differences between Momentary and Latching settings for a Logic In toggle? Momentary and Latching are also different in the following ways: l When a port is set to Latching, the corresponding toggle control is read-only. This means that when the toggle control is a participant in a link, it is the only control that sets the value for all participants in the link. Also, there can be only one read-only participant in a link. l When a port is set to Momentary, the corresponding control is not read-only. When it participates in a link, any of the participants can set the value of the link (unless of course one of the participants is a read-only control). This means that you could have two or more momentary physical switches control the state of a toggle link, such as a room combine block's wall toggle control. Or, you can link an external control system's toggle control to a Logic In toggle control, allowing both a physical momentary switch and an external control system such as an AMX controller to change the value of the link. What kind of device can I connect to a Logic In port? You can use physical momentary or multiple position switches, relay contacts, or active logic circuits. The Logic In port for each HAL system device has a pull-up resistor which keeps the port signal at a logic high (5 V) when nothing is connected. To change the state of the Logic In, a device connected to the input port must pull the port signal down lower than the threshold for logic low, which is specified in the data sheet for the device (HAL, DR4, DR5, for example). Typically you do this by connecting the port signal pin (labeled with a number near the physical connector) to one of the ground reference pins (labeled with the letter G). 71

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What are other differences between Momentary and Latching settings for a Logic In toggle?
Momentary and Latching are also different in the following ways:
l
When a port is set to Latching, the corresponding toggle control is read-only. This means that when the tog-
gle control is a participant in a link, it is the only control that sets the value for all participants in the link.
Also, there can be only one read-only participant in a link.
l
When a port is set to Momentary, the corresponding control is not read-only. When it participates in a link,
any of the participants can set the value of the link (unless of course one of the participants is a read-only
control). This means that you could have two or more momentary physical switches control the state of a
toggle link, such as a room combine block’s wall toggle control. Or, you can link an external control sys-
tem’s toggle control to a Logic In toggle control, allowing both a physical momentary switch and an exter-
nal control system such as an AMX controller to change the value of the link.
What kind of device can I connect to a Logic In port?
You can use physical momentary or multiple position switches, relay contacts, or active logic circuits. The Logic
In port for each HAL system device has a pull-up resistor which keeps the port signal at a logic high (5 V) when
nothing is connected. To change the state of the Logic In, a device connected to the input port must pull the port
signal down lower than the threshold for logic low, which is specified in the data sheet for the device (HAL, DR4,
DR5, for example). Typically you do this by connecting the port signal pin (labeled with a number near the phys-
ical connector) to one of the ground reference pins (labeled with the letter G).
CHAPTER 2: Hardware Component Details
71