OSDP Interface
OSDP reader (software configurable)
Caution
Mounting jumpers JP2 and JP4 results in a connection of strong pull-up/pull-down resistors (560 ohms) to the RS-485 bus. These jumpers must be mounted/unmounted together, i.e. one jumper cannot be mounted alone. Strong pull-up and pull-down resistors can be connected only and exclusively to one arbitrary device on the OSDP bus.
Mounting JP3 results in a connection of the terminating 120 ohm resistor between wires A and B of the OSDP bus. The terminating resistors may be connected exclusively on the first and last modules on the OSDP bus. We recommend the connection of these resistors on the first and last modules.
Connection Recommendations
Figure 1. Wiring diagram for two-wire connection
Figure 2. Wiring diagram for three-wire connection
