Cypress Chameleon CTM-130 Manual do Utilizador descarregar pdf (Página 3)

3 3BMODBUS Configuration Commands

MODBUS messages can be configured to be sent as MODBUS RTU messages encapsulated in UDP

packets, or as MODBUS TCP messages. MODBUS RTU over UDP messages minimizes wireless data usage

at the cost of unreliable data delivery. MODBUS TCP messages provide reliable data delivery at the cost of

increased wireless data usage. The default configuration for the modem in MODBUS mode is to use

MODBUS TCP as the over-the-air protocol.

2 MODBUS Configuration Commands

The following section details the modem specific commands used to configure the modem as either a

MODBUS slave gateway or a MODBUS master gateway.

Note: For all commands to be saved to non-volatile memory, a “cmd save” must be entered before

turning off or restarting the modem.

2.1 MODBUS Serial Master Gateway Modem Configuration

The following set of modem commands will configure the modem to act as a MODBUS serial master

gateway using MODBUS RTU between the MODBUS master application and the modem, and using

MODBUS RTU over UDP over-the-air.

cmd factory Reset modem configuration to factory defaults

cmd modbusctm130 1 Set modem to use MODBUS RTU over UDP over-the-air

to maintain backward compatibility with CTM13x modems

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