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94 Revision 10 – 1/09/2015 FTS 370d/w/r

Appendix B: Vanguard Modbus Specification Map (V8).

Modbus RTU over RS485

The Vanguard system master controller (VSMC) is configured to be a Modbus slave device. It is statically configured as

follows:

Station ID

Parity

None

Baud Rate 9600 Stop Bits 1

Data Bits

Flow Control

None

Modbus RTU over TCP

The Vanguard system master controller is configured to be a Modbus slave device. It is statically configured as Station 2

and host TCP socket # 502. The Modbus RTU over TCP protocol expects messages to be formatted exactly as the Modbus

RTU over RS485 protocol.

Behavior notes:

1. The Vanguard system’s IP address mode can be set to static or dynamic via the ‘MONITORING CONFIG ->

LOCAL ETH CONFIG’ menu on the Vanguard system 1 controller.

2. The Vanguard Modbus RTU over TCP socket #502 will accept incoming connections. However if no data is

transmitted through the socket for 5 minutes it will be terminated.

Behavior during Controller Reboots

The Modbus interface (both via RS485 or Ethernet) is disabled during the Vanguard controller power-up diagnostic

sequence. Modbus messages will not receive a response during this time-period, which lasts 45 seconds for each system

controller. Due to this behavior, it is advised to allow up to 5 minutes for the Vanguard controller to complete its power-up

sequence before normal Modbus operation begins.

Implemented Modbus Map

The following tables detail the data that can be read using Modbus function code 03, and the values that can be written one

Modbus Info Registers

Address Read/Write Register Name Description / Values

0 R

Modbus Map Version

Number (version) 0-65535

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 117 118

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