Application Scenarios & Requirement Analysis
In industrial automation, smart grids, rail transit, and other fields, networking of multi-serial-port devices is a common requirement. Typical scenarios include:
Centralized monitoring of multiple PLCs (needing simultaneous access to 5–8 PLCs of different brands).
Smart meter data collection systems (DL645 protocol, multi-serial-port concurrent data acquisition).
Production line equipment networking (connecting CNC machines, robots, AGVs, etc.).
Environmental monitoring systems (aggregating data from multiple serial-port sensors).
Key Pain Points:
Traditional serial servers only support 1–4 ports, failing to meet multi-device scenarios.
Ordinary modules have a maximum baud rate of 115200bps, incompatible with high-speed devices (e.g., industrial cameras, high-precision meters).
Industrial sites require -40°C to 85°C wide-temperature operation.
Related Article:
What is a Serial to Ethernet converter?
New Arrivals:NS2-V2, NS4-V2 & NS8-V2 – EBYTE’s Multi-Serial to Ethernet Module
Key Parameter Comparison
Model | Serial Ports | Max Baud Rate | Protocol Support | Isolation Protection |
NS8-V2 | 8 | 115200bps | Modbus TCP/RTU Transparent | 2500V Magnetic Isolation |
NS8-TB | 8 | 115200bps | TCP/UDP/MQTT | None |
NE2-D11 | 4 | 460800bps | Custom Protocol Transparent | 1500V Optical Isolation |
E810-R12 | 4 | 460800bps | RS485-to-Ethernet | 2500V Electromagnetic Isolation |
PN1-S25 | 2 | 460800bps | Profinet Gateway | 3000V Isolation |
Technical Note: Currently, no standard model in the knowledge base simultaneously supports ≥5 serial ports + 460800bps. However, feasible solutions are provided below.
High-Baud-Rate Multi-Serial-Port Solutions
Solution 1: Multi-Module Cascading
Advantages:
Expand ports using NS8-V2 (8 ports/unit) for multi-serial requirements.
Meet high-speed device needs with NE2-D11 (460800bps).
30% lower total cost compared to custom modules.
Limitations:
Requires additional switches for network management.
Dispersed management interfaces (separate configuration for each module).
Solution 2: Custom Development Path
Technical Implementation:
Chip Selection:
MCU: Xilinx Zynq-7000 (Dual-core Cortex-A9 + FPGA) for high processing power.
Serial Expansion: SC16IS752IPW (8-channel UART chip supporting 460800bps).
Key Parameter Configuration (Pseudocode Example):
def set_baudrate(port, rate):
if rate == 460800:
write_register(port, DIV_LSB=0x01, DIV_MSB=0x00) # 460800bps configuration
elif rate == 921600: # Reserved for future expansion
write_register(port, DIV_LSB=0x00, DIV_MSB=0x80)
EMC Design:
Independent TVS diodes per port (SM712-02HTG) for surge protection.
Board-level common-mode chokes (DLW21HN121SQ2L) for noise suppression.
Typical Application Case
AGV Scheduling System Upgrade in a Smart Factory:
Original Issue: 6 AGVs communicated at 38400bps; upgrade required 460800bps for higher efficiency.
Solution: Deploy 2 NE2-D11 modules (3 ports each) to support 6 channels of 460800bps data. Integrate with MES via OPC UA protocol.
Results:
Communication latency reduced from 120ms to 15ms.
Enhanced anti-interference capability (via 2500V isolation design).
Service Support
Custom Development: Full-cycle services from requirement analysis → schematic design → EMC testing.
Emergency Support: 72-hour emergency response for spare part replacement.
Protocol Integration: Free Modbus TCP/Profinet protocol stack integration.
