User guide

Diagnostics – Modbus TCP/IP Server
LED Status:
1. Good Communication (Solid Green) – The gateway is connected to a Modbus TCP/IP Client and
communicating as expected.
2. Not Connected (Flashing Green) – The Modbus TCP/IP Client has never attempted to open up
communication to the gateway.
3. Connection Timeout (Flashing Red) - The gateway has lost a connection to the Modbus TCP/IP
Client.
4. Off:
a. No Power.
b. No Ethernet cable plugged in.
Variables:
1. FC01 Read Coil Status – Modbus Function Code 1: Number of Read Coil Status requests received.
2. FC02 Read Input Status – Modbus Function Code 2: Number of Read Input Status requests
received.
3. FC03 Read Holding Registers – Modbus Function Code 3: Number of Read Holding Registers
requests received.
4. FC04 Read Input Registers – Modbus Function Code 4: Number of Read Input Registers requests
received.
5. FC05 Force Single Coil – Modbus Function Code 5: Number of Write Coil Status requests
received.
6. FC06 Preset Single Register – Modbus Function Code 6: Number of Write Holding Register
requests received.
7. FC15 Force Multiple Coils – Modbus Function Code 15: Number of Write multiple Coil Status
requests received.
8. FC16 Preset Multiple Registers – Modbus Function Code 16: Number of Write multiple Holding
Register requests received.
9. FC23 Read/Write 4X Register – Modbus Function Code 23: Number of Read/Write Holding
Registers requests received.
10. Successful Responses Sent – Total number of Read/Write messages sent by the gateway.
11. Error Responses Sent - Total number of Read/Write errors sent by the gateway.
12. Timeouts, TCP Closed – Total number of Read/Write timeouts that cause the Modbus TCP/IP
connection to close.
13. TCP Connections Open – Number of Modbus TCP/IP connections that have been opened to the
gateway.
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