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Telemetry Module MT-102 User's Manual - BlueNote Communications

Telemetry Module MT-102 User's Manual - BlueNote Communications

7.4. Modbus RTU Slave

7.4. Modbus RTU Slave mode In this mode, the module acts as a network node serving both own resources and all connected to PORT2 devices operating in Modbus RTU Slave mode, waiting for GPRS data frames. Upon reception of the frame, it investigates recipient's address (matching declared Modbus ID with its own). If the address matches, the instruction is carried out and confirmation set to sender. If it does not match the frame is forwarded to PORT2. The module waits for 0,5 sec for reply. When reply comes or the time elapses, the module whether new data frame arrived via GPRS. Sending frames not addressed to module's ID to PORT2 is unconditional as module does not have the list of connected to PORT2 Slave devices. Replies are sent to sender as standard. Sending of replies to additional Master units can be defined in routing table. The IP address of additional Master is stated in the second column of the table, and the device Modbus ID from which replies have to be sent to additional master are stated in third column. If third column states "0", replies from all slaves will be sent to corresponding IP address. This means that it is possible to send replies to any number of devices acting as protocol Master (Multimaster mode). 27

7.5. Modem mode In this mode, the module establishes communication channel between PORT2 and internal GSM modem input. The channel is available after entering PIN code and logging on to the network, relieving the user of modem initiation. In order to control the transmission, AT commands issuing is necessary. Full control of modem's operation is carried out by external device connected to PORT2 of the module. This mode does not require configuration of any parameter beyond right PIN code but in turn does not give access to any MT-102 features except transmission control. Being able to use transmission control, modem may be reset if no activity is detected in defined time. It prevents the phenomenon of an irrevocably "hanging modem" which in case of remote deployment is usually expensive. 7.6. Modbus RTU Mirror mode Modbus RTU Mirror mode is an extension of MODBUS RTU Slave mode. Seen from GPRS side the module acts exactly as it does in Modbus RTU Slave mode securing remote access to own resources as well as resources of any slave connected to PORT2. The addition feature provides the possibility of resource mapping of devices connected to PORT2 into internal module Registers. With this option active, the module cyclically reads mapped areas of external devices and refreshes internal Registers. Writing to external devices is possible as well. In Mirror mode, for every internal program cycle (100 ms) the module compares state of mapped areas and upon detection of change in any Register, a frame writing the change to external device is generated. Values in internal registers may be changed remotely by master system or locally by internal (user defined) program. Highlights of Modbus RTU Mirror mode: The ability to remotely read resources of different areas and devices by one Modbus frame (reading internal Registers of the module), thus increasing efficiency of GPRS transmission. The ability to generate alarms on state change in remote devices. Local data reading in conjunction with processing of data by internal program and function of generating events significantly increases potential and dynamics of the whole system, simultaneously reducing costs of transmission compared to systems based on cyclic querying from master The ability of local control of the object including extension devices. 28

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