P-Bus Gateway Firmware PBGW2.128 Version 1.61

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Modbus RTU Server Protocol Settings In this page you can make changes to the Modbus communication configuration. A Modbus RTU connection can be established over each of the 3 electrical interfaces: RS-232, RS-485 and Ethernet (TCP/IP). It’s recommended to use one connection at the same time. Check the checkbox next to Enabled of the electrical interface you want to use and uncheck the other two. At RS-232 and RS-485 you can specify a ‘Slave-address’. This is the modbus slave address the gateway will respond to at modbus requests form a modbus client. Also the modbus inter-frame timeout can be specified. If the checkbox before ‘Auto’ is checked, the gateway will calculate the inter-frame timeout automatically. In most cases this auto timeout is sufficient for reliable communication. Sometimes it’s desirable to manually specify the inter-frame timeout to be able to adjust the value to the connected client. For example if the client drops out in the middle of a modbus frame for a long period of time, the frames don’t always survive intact when they’ve reached the gateway. This could lead to frame-errors and delays in the communication. In this case uncheck the checkbox before ‘Auto’ and specify the inter-frame timeout in the field next to it (in tenths of milliseconds). Under ‘Modbus on TCP/IP’ you can specify the TCP Port number at which the gateway listens for modbus requests. Match this to the Port number at which the modbus client sends out its requests. The default TCP Port for modbus communications and also the gateway’s factory default is 502. NOTE: !! When applying the settings (‘Apply Settings’) all communications could be interrupted temporarily. 14/17 Persy Control Services B.V. Netherlands PBGW2.128 – P-bus Gateway PCS0113en 02.2009
ModBus Registers Each PTM I/O-module contains 9 registers (16-bit). There are 4 read registers, 4 write registers and 1 register to identify the moduletype. The interpretation of the read and write registers depends on the moduletype. For example: a digital output module (PTM1.2Q250) with 2 relay outputs just needs 2 bits (0 or 1) of one register to indicate if a relay is on or off. An analog input module (PTM1.4R1K) with 4 inputs uses one register for each A/D converter (input). A detailed description of the I/O module’s register contents can be found in the documents: PCS013x to PCS018x. The P-bus Gateway is a transparent gateway. This means: all of the I/O-module’s registers are identically matched on modbus level. With use of holding registers or input registers the register contents of every I/O-module can directly be read or written to. modbus functions The following modbus functions are supported by the gateway: Function Code Modbus Function Dec. Hex. Description 3 0x03 READ HOLDING REGISTERS 4 0x04 READ INPUT REGISTERS 6 0x06 WRITE SINGLE REGISTER 16 0x10 WRITE MULTIPLE REGISTERS There’s no distinction being made between input registers and holding registers. So the modbus functions 3 and 4 will always have the same result. register mapping The general mapping of the modbus registers is as follows: Dec. Hex. Description 0 – 0x0000 – Diagnostic functions of the gateway 255 0x00FF 256 – 511 512 – 2559 2560 – 2815 0x0100 – 0x01FF 0x0200 – 0x09FF 0x0A00 – 0x0AFF Moduletype Registers PBUS 1 Register 256 matches the moduletype at moduleaddress 0. Register 257 matches the moduletype at moduleaddress 1. etc, etc.. Read/Write Registers PBUS 1 Per I/O-module: 4 read registers 4 write registers Register 512-515 matches read register 0-3 of module 0. Register 516-519 matches write register 0-3 of module 0. Register 520-523 matches read register 0-3 of module 1. Register 524-527 matches write register 0-3 of module 1. etc, etc.. Moduletype Registers PBUS 2 Mapping in the same manner as for PBUS 1 2816 – 4863 0x0B00 – 0x12FF Read/Write Registers PBUS 2 Mapping in the same manner as for PBUS 1 Only the I/O module write registers are writable (modbus functions 6 and 16). All other registers are read-only. Persy Control Services B.V. Netherlands PBGW2.128 – P-bus Gateway 15/17 PCS0113en 02.2009
Page 1 and 2: P-Bus Gateway Firmware PBGW2.128 Ve
Page 3 and 4: Select ‘Use the following IP addr
Page 5 and 6: Device Setup TCP / IP Settings NOT
Page 7 and 8: P-Bus Settings (1) In this page yo
Page 9 and 10: P-Bus Modulelist (1) . This page d
Page 11 and 12: P-Bus Virtual Modules (1) Open com
Page 13: P-Bus Virtual Modules (3) In the l
Page 17: Firmware upgrade The firmware in th

P-Bus Gateway Firmware PBGW2.128 Version 1.61

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