ᐅ Door contact cable routed to the technical/mechanical room

Routing the door opener cable to the utility room is correct. You will need to disconnect the network cable in the utility room and integrate the separate power supply for the door opener.

Well, it’s not necessarily correct—most manufacturers assume that the door release is controlled directly by the door station. At best, they offer the option to control a remote relay via an RS485 connection (which would require an additional cable).

However, it is generally better to have the door control separate from the door station, as this provides increased security. The downside is that you now have to link the two components together.

I believe the Metzler should also be capable of controlling a network/web relay, but you need to check the options (this is usually possible with Akuvox and Hikvision). If so, you can simply use an IP relay in the technical room, which then receives the signal (usually a URL request, possibly with username/password if desired) from the door station via the network and activates the door release.

That would mean that if the cable from the door opener is routed directly to the outdoor unit of the intercom system, an additional cable is still required for the separate power supply of the door opener. You would then have the positive and negative terminals directly in the outdoor unit. It doesn’t get any simpler than that to get inside the house.

The whole setup is a bit awkwardly drawn.

Harakiri schrieb:

Well, it’s not necessarily correct, as most manufacturers assume that the door release is controlled directly by the door station. At best, they offer the option to control a remote relay via an RS485 connection (which would require an additional cable).

Basically, it is better to have the door control separated from the door station for increased security. The downside is that you now have to link the two components together.

I think the Metzler should also be able to control a network/web relay, you just need to check the options (this usually works with Akuvox and Hikvision). If so, then you can simply use an IP relay in the technical room, which receives the signal (usually a URL request, possibly with user/password if desired) from the door station via the network and operates the door release.

Basically, I asked myself the same question since all signal controls run through the network. So there should be a “command” that triggers the network relay in the technical room. This would solve the problem. Unfortunately, Metzler cannot assist further, and such a module is not offered. The firmware is from Hikvision. The question is whether the Hikvision relay (DS-PM1-O1L-WE) will work here. Even if the cable to the outdoor station were installed, it still wouldn’t work because, according to the specifications, the door station only supplies max. 12V/500mA (12 volts/0.5 amps). However, the door strike requires 1-2A at 12V (1 to 2 amps at 12 volts).

Since I have exactly the same problem (or rather, I am missing the control cable from the outdoor unit to the technical room), I would appreciate it if you could share a solution, if possible. Thank you!

Unfortunately, I have no experience with Metzler, but the IP door station from Doorbird offers two ways to securely control the door contact from the inside: either through a relay contact on the indoor unit or via a separate I/O door controller installed in the utility room. For the above reasons, connecting the door contact directly to a switching relay on the outdoor unit is not much of a challenge for technically skilled intruders.