User manual

ManualsBrandsTASKIT ManualsDev KitsPCB extension board gpio.AI seriell

Features

• Modbus-Interface

• Widely used protocol for measuring and

automation

• gpio.NET Core Interface

• Uniform set of commands and registers

• Supports Modbus RTU and Modbus ASCII via

RS232/RS485

• Supports Modbus ASCII via USB

• Gateway with protocol conversion between

RS232/RS485 (RTU) and USB (ASCII)

• Configuration stored in EEPROM

• RS232/RS485

• Selectable baud rate from 1200 Baud to 1MBit

• Free configurable serial device (data width,

parity, stop bits)

• Selectable operation mode (RS232 or RS485)

• USB

• USB 2.0 CDC-Device

• Unique serial number

• Modbus-Address changeable through Modbus

command via serial line

• 1 KByte EEPROM

• Seperated Config-Section and User-Section

• Both sections can be write-protected

seperately

• 8 analogue inputs

• Interface for voltage or current input

• 0-4.096 V, 0-20 mA

gpio.NET

Preliminary

Short Description

gpio.NET

analogue Input-

Card

gpio.AI

U-Series

gpio.AI

R-Series

Summary of content (7 pages)

PAGE 1
Features • • • • • • • Modbus-Interface • Widely used protocol for measuring and automation gpio.
PAGE 2
gpio.AI Overview The gpio.NET Core interface is extended by analogue inputs each providing selectable shunts for current measurement. The modules easily integrate into existing Modbus systems and can be identified and configured by a unique serial number even in a running system. Beyond that, they offer a uniform set of registers over the hole gpio.NET family. Draft Drawing 1: Dimensions Interfaces For communication, gpio.NET modules feature up to two Modbus interfaces.
PAGE 3
gpio.AI over USB.1 A gpio.NET card is detected as a virtual serial port by the host system and so does not differ from a real one from a programs point of view. USB device port is used as power source if connected to a host. As an alternative, PIN9 from either X10 or X11 can used instead.2 When using PIN9 care has to be taken to use a well-regulated 5 volts source. RS232 A serial interface with RS232 levels is available at gpio.NET module's X11 DSUB connector.
PAGE 4
gpio.AI Drawing 1: RS485 bus on USB with additional power supply Individual parts of a bus constructed as shown in drawing 2 can be supplied at arbitrary points by an isolated power supply. Mind to really seperate VBUS of these groups. The example demonstrates this by means of the first card connected to the host PC via USB and the rest of the bus being supplied by a seperate power source. Opened jumper J7 disrupts the VBUS connection on DSUB's PIN9.
PAGE 5
gpio.AI 0x0000 HREG_CTRL 0x1000 reserved 0x0001 HREG_PM 0x1001 HREG_PM 0x0002 HREG_BAUDSEL 0x1002 HREG_BAUDSEL 0x0003 HREG_DBITS 0x1003 HREG_DBITS 0x0004 HREG_PARITY 0x1004 HREG_PARITY 0x0005 HREG_STOP 0x1005 HREG_STOP 0x0006 HREG_SERIAL_MODE 0x1006 HREG_SERIAL_MODE 0x0007 HREG_MODBUS_MODE 0x1007 HREG_MODBUS_MODE ... reserved 0x0100 SAMPLE_RATE 0x0101 SAMPLE_EXP ...
PAGE 6
gpio.AI HREG_PM This register is currently unused. HREG_BAUDSEL Specifies the baud rate that is used on RS232/RS485. The register contains one of those selectors described below. Selector Baud rate Selector Baud rate 0 1200 6 57600 1 2400 7 115200 2 4800 8 230400 3 9600 9 250000 4 19200 10 500000 5 38400 11 1000000 HREG_DBITS Contains the number of data bits used on serial line – selectable between seven and eight bits.
PAGE 7
gpio.AI MODBUS_MODE To switch between MODBUS RTU and ASCII modes this register is used. Changes will not affect the USB connection that always operates in MODBUS ASCII. Choose 0 for ASCII or 1 for RTU. SAMPLE_RATE Specifies the rate data is sampled on the analogue inputs. Higher values result in faster device responses. Default value after power-up is 1000 Hz. SAMPLE_EXP Defines the amount of ADC samples that are used to calculate an average that can be read from the input registers.