The ISONAS reader-controller supports two TTL output leads. These leads provide logic level signals that can be used to communicate with external systems such as alarm sounders or lights.
These TTL leads are normally held at +5V DC, and when activated, drop to 0V DC. The ISONAS driver circuits for these TTL signal leads can source or sink 24 milliamps. This means that the external system must not draw more than 245mA from the TTL output when it is at +5 VDC nor source more than 24mA when the TTL output is at 0 VDC.
Some external systems (example: alarm systems) will directly accept these logic signals. For other usages, these leads can drive external relay boards, which are capable of controlling larger power draws.
An great example application would be a DOTL (Door Open Too Long) alert in a factory or industrial setting. You would use a relay module, such as the Altronix RBSNTTL, with your ISONAS system to trigger an alarm sounder, such as the ATW Terrier, to notifiy you if a door has been held open too long.
These TTL leads are normally held at +5V DC, and when activated, drop to 0V DC. The ISONAS driver circuits for these TTL signal leads can source or sink 24 milliamps. This means that the external system must not draw more than 245mA from the TTL output when it is at +5 VDC nor source more than 24mA when the TTL output is at 0 VDC.
Some external systems (example: alarm systems) will directly accept these logic signals. For other usages, these leads can drive external relay boards, which are capable of controlling larger power draws.
An great example application would be a DOTL (Door Open Too Long) alert in a factory or industrial setting. You would use a relay module, such as the Altronix RBSNTTL, with your ISONAS system to trigger an alarm sounder, such as the ATW Terrier, to notifiy you if a door has been held open too long.
For more information, check out the knowledge base article by clicking here. (PDF)
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