Edwards EST 3-SSDC2 Single Signature Driver Controller

Edwards 3-SSDC2 — Single Signature Driver Controller local rail module, supplied with one 3-SDC1 Signature Device Card.

The Signature Driver Controller is the intelligent interface between an EST panel CPU and the Signature Series devices on a signalling line circuit. It maps the loop on power-up, so missing, extra or swapped devices are reported by physical location, not only by address. Capacity is set by the plug-in 3-SDC1 cards: catalogue sheet E85010-0130 confirms one card is included, and a second makes it a two-circuit module.

• One Signature data circuit as supplied, expandable to two
• 125 intelligent detectors and 125 module addresses per 3-SDC1 card
• Standby 144 mA, alarm 204 mA at 24 VDC, with a full loop of devices
• Signature circuit 20 VDC +/- 5 percent, maximum 100 Ω and 0.5 µF
• Class B, A or X wiring; one local rail space, ten per node

The headline 250 detectors and 250 modules on that sheet is the two-circuit figure, belonging to the 3-SDDC2, which ships with two cards. 3-SSDC2-E is the EN54 model and 3-SDC1 the card alone. It is backward compatible with the 3-SSDC, 3-SDDC, 3-SSDC1 and 3-SDDC1.