As part of your installation, you might need to include a Mercury MR52 interface module.
The following diagram demonstrates how to connect the module.
| A | Reader connections | The wire colors in the illustration refer to "pigtail" HID readers; the information in parentheses refers to "terminal block" HID readers. |
| B | Inputs | Inputs 1 to 8 can be configured to use End-Of-Line (EOL) resistors, and for normally open or normally closed contacts. |
| C | Address switches | Used to set the device address. For more information on address settings on the Mercury module, refer to the manufacturer's instructions. |
| D | Reader power | 12V = 12 V dc at readers, PT = voltage “passed through” to
readers. IMPORTANT: For UL294
compliant Synergis™
installations, always install the jumper in the PT
position.
|
| E | 2W/4W Select | Install jumper in 2W position (4W is not supported). |
| F | Line termination | For end-of-line interface modules, install jumper J5 (MR52) or J4 (MR52-S3) for 120 Ohm line termination (J6 is not used). |
| G | RS-485 | RS-485 bus connection to other Mercury modules. |
| H | Relay outputs | 6 x Form-C MR52: 5A inductive @28 V dc, 0.6 PF MR52-S3: NO: 5A, NC: 3A, inductive @28 V dc, 0.6 PF |
| I | Power In | Connect + to VIN (observe polarity). Connect - to GND. Use 20 AWG wires minimum. |
| J | Resistors | For OSDP integrations, prevent readers from misinterpreting noise
on a non-driven RS-485 line as data by installing a 1k ohm pull-down
resistor from D0 to GND on both Reader 1 and Reader 2. For wiring distances over 10 meters, install a 120 ohm termination resistor between D0 and D1, as well as between A (-) and B (+) on the RS-485 bus of the last connected reader. To find out whether you need to add a 1k ohm pull-down resistor between D0 and GND, see [KBA-78953] Communication issues between OSDP readers and some Mercury hardware. |