Cypress Chameleon CTM-130 Manual de usuario descargar pdf (Pagina 3)

MODBUS Self Slave

MODBUS TCP messages. MODBUS RTU over UDP messages minimizes wireless data usage at the cost of

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

wireless data usage. The default configuration for the gateway in MODBUS mode is to use MODBUS TCP

as the over-the-air protocol.

For added security, MODBUS Secure can be used to securely exchange MODBUS data. This is to support

applications that require secure communication through SSH tunneling.

To enable MODBUS Secure, the following commands must be entered:

cmd modbussecure 1 #Default value 0

cmd save

cmd pwr mode 2

Note: SSH tunneling must be setup between the remote server and CTM modem. See Securing the CTM-

200 using SSH Tunneling application note for more details.

The details and explanations of the commands used in these examples can be found at the following link:

http://cloud.cypress.bc.ca/documents/Command_Ref/CTM200/

2 MODBUS Self Slave

A MODBUS Master Application can “read” and “write” to a CTM modem configured as a MODBUS Self

Slave. See http://www.cypress.bc.ca/modbus_messages_ctm200.html for example read/write messages

to send from the MODBUS Master Application to the CTM modem.

Configuration for MODBUS Self Slave modem:

cmd mode 6 #MODBUS host interface

cmd modbusadd 3 #Self slave using MODBUS ID 3

cmd save #Save configuration

cmd pwr mode 2 #Power cycle modem

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Cypress Chameleon CTM-130 Manual de usuario Pagina 3