EAU-321 Multi Protocol Serial Port Card

Installation and System Capacity Planning

Physical installation

EAU-321 is installed inside the system unit and has two typical installation methods:

Independent system (single panel): directly stacked and installed on the EAC300 processor board. The PC/104 bus is electrically connected through stacked connectors, with EAU-321 located above the processor board and secured with nylon support columns at the four corners.

Distributed system: First install the AUTROLON communication board EAU-310, and then stack EAU-321 on top of EAU-310. In this configuration, EAU-310 is responsible for AUTROLON network communication between panels, while EAU-321 is responsible for serial communication with third-party devices.

In a distributed system, EAU-321 should be installed first in the designated 'Startup Panel', as the AUTROLON download function on port 4 needs to be used on this panel.

System capacity limit

The AutoSafe system has clear capacity limitations for expanding communication boards, and engineers must comply with them when planning:

Scenario 1: System unit without battery

Each system unit can install up to 3 different types of communication boards

Optional combinations: any three of EAU-321 (serial board), EAU-310 (AUTROLON board), EAU-330 (Ethernet board)

If the distributed system requires the installation of EAU-310, the remaining available slots are 2 additional communication boards

Scenario 2: System unit with battery

The battery (usually a backup power source) will occupy some internal space, so only a maximum of 2 communication boards can be installed

If the distributed system requires the installation of EAU-310, the remaining available slots are only one additional communication board

These limitations stem from the power supply capacity and physical space of the backplane, and cannot be over configured. If the project requires more external communication interfaces, consideration should be given to using multiple system units or extending through external protocol converters.

Detailed explanation of technical specifications

Serial port electrical parameters

RS232 mode:

Input impedance: minimum 3k Ω

Input voltage swing: maximum ± 30V (withstand capacity)

Output voltage swing: minimum ± 5V, typical ± 7V

RS422/RS485 mode:

Differential input threshold: -0.2V (minimum) to+0.2V (maximum)

Input impedance: minimum 12k Ω

Input current:+1.0mA maximum (when VIN=12V)

Differential output voltage symmetry: minimum 2.0V between high/low states (when the load resistance is 50 Ω)

Short circuit protection: All outputs have continuous short circuit protection, which will not damage the driver

Bus and power supply

PC/104 bus: Both 8-bit and 16 bit bus connectors are installed simultaneously. The 16 bit connector is mainly used to provide additional interrupt levels.

Power requirement:+5V DC ± 10%

Current consumption: 80mA typical value (when all outputs are unloaded). When multiple external devices are connected and the output drives a large load, the current will increase accordingly, and the total power margin of the system needs to be considered in the design.

Working environment: Temperature range of -40 ° C to+85 ° C, humidity range of 5% to 95% (non condensing). This wide temperature range makes EAU-321 suitable for non temperature controlled environments such as outdoor cabinets and ship deck areas.

Communication parameters (AutoSafe application)

When using the AutoCom protocol within the AutoSafe system, fix the following parameters:

Baud rate: 9600 baud

Data bits: 8 bits

Stop position: 1 position

Verification: None

If a third-party device wants to communicate with AutoSafe through port 1/2, it must be configured with exactly the same parameters, otherwise a valid connection cannot be established.

Typical application scenarios

1. Building management system integration

Building management systems typically exchange status information with fire protection systems through Modbus RTU or BACnet MS/TP protocols. Engineers can configure port 1 or 2 of EAU-321 to RS485 mode and connect it to the serial bus of BMS. AutoSafe, as a slave station, regularly reports the status of fire alarms, malfunctions, isolation, etc; BMS acts as the main station polling data. The redundant configuration of ports 1 and 2 ensures link reliability - when the primary port fails, the system automatically switches to the backup port.

2. Paging system interface

Many paging systems receive trigger signals through the ESPA protocol. EAU-321 is connected to the ESPA interface module via RS232. When the AutoSafe system detects a fire alarm, it sends ESPA format commands through port 1 or 2, and the paging system immediately plays the preset voice alarm information.

3. PLC data exchange

In industrial settings, fire protection systems may need to send fire alarm zone information to DCS or PLC. Through the RS485 port of EAU-321 and in conjunction with the Modbus RTU protocol, AutoSafe can act as a Modbus slave, mapping the status of each detection area to hold registers. The upper PLC periodically reads these registers to achieve linkage between fire protection status and process control.

4. Remote diagnosis and maintenance