Rs-485 Interface For Card Readers - Bosch AMC2 Installation Manual

Modular controller

Hide thumbs Also See for AMC2:

Table of Contents

AMC2 Modular Controller

4.13

RS-485 Interface for Card Readers

The AMC2-4R4 has four RS-485 interfaces. Each interface is connected using a 10-pin

pluggable screw connector (S2, S7, S14, and S19).

Figure 4.18: Location of the RS-485 interfaces for external devices

The interfaces 1 and 2 build a bus (bus 1) for its own like the interfaces 3 and 4 (bus 2).

All eight possible readers can connect to each of the busses in any combination. However, the

addresses of the readers must be unique on an AMC2.

The voltage on the interface is equal to the input voltage of the AMC2-4R4

A complete connection diagram of the RS-485 interface is shown in chapter Connecting

Diagrams, page 44.

Notice!

Please check which voltage the readers require. If this does not correspond to the input

voltage, this will require an external power supply.

Notice!

If the current consumption on the interface is higher than 1.5A then change the distribution

to the other interfaces or use an external power supply for the reader.

Notice!

Damage caused by wrong voltage

If the power supply at the AMC is set to 24 V, the voltage will rise on the bus line

correspondingly. Readers that are not suitable for this voltage will be damaged.

Amc2-4r4