User's Manual
Table Of Contents
- Introduction
- Contacting BW Technologies
- Safety Information - Read First
- Getting Started
- The Personnel Alert Base Station
- Installation
- MODBUS Wiring and Configuration
- Baud Rate and Parity Configuration
- Setting the Dip Switch Addresses
- Alarm Relay Contact Wiring and Configuration
- Wiring DC Power
- Testing Manual Alarms
- Radio Frequency (RF) Optimization
- Setting the Badge ID
- Area System Planning
- Alarms (TBD)
- Maintenance
- Troubleshooting (TBD)
- Replacement Parts and Accessories
- Specifications
Personnel Alert: Base Station
User Manual
MODBUS Wiring and Configuration
The MODBUS protocol is designed for master-slave
communication. The base station operates as a MODBUS
slave device and must be connected to a MODBUS master,
such as a MODBUS compatible PLC Control System or an
industrial PC.
MODBUS Wiring
The base station can be configured for either a 2-wire
(half duplex) or 4-wire (full duplex) MODBUS interface.
MODBUS signalling can be used to
• set and clear alarm status,
• read tables containing badge IDs,
• read alarm acknowledgements of all badges that are
within range of the base station.
All MODBUS wiring is connected to the 2-screw down
terminal blocks, TB1 (upper) and TB2 (lower) that are
located on the main board.
Note
For 2-wire operation on the main board, the jumper
pin JP1 must be shorted (closed) by using the
supplied jumper.
Figure 12. MODBUS Wiring on Main Board
2-Wire MODBUS (half-duplex)
1. Connect the RS-485 positive lead to the +T/Rx on
TB2.
2. Connect the RS-485 negative lead to the –T/Rx on
TB2.
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