ATMBUS User's Manual - De ce vendingtools.ro?
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1. 4mm pitch See Fig 1 and Table 1 for details 00000 Nn onuw 00000 gt Fig 1 Pin Function Pin Function 1 Bus DATA 6 N C 2 N C 7 N C 3 N C 8 N C 4 GND 9 5Vcc 5 GND 10 N C Table 1 Pinout for ATMBUS connector Pin no 1 is used also for sending and receiving messages over the bus Using this architecture any of the available modules can act as a master for the entire bus This can simplify the developing of any vending machine 1 3 ATMBUS communication The ATMBUS communication is using the parameters in Table 2 Parameter Value Baud rate 9600 Data bits 8 Parity None Stop bits 1 Table 2 ATMBUS communication parameters ATMBUS communication protocol is very simple and effective easy to develop on microcontrollers PC or SBC boards One RS232 port or USB to RS232 converter is user All other ports on your equipment can be use for other purposes so you will no longer need complex wiring or external devices such as USB hub USB hub power supply etc The communication protocol is universal consisting of 5 header bytes message body and a simple XOR CRC Header lt 5 bytes gt Content lt variable length gt CRC lt 1 byte gt Table 3 ATMBUS message package Because it is a one wire communication using same wire for both RX and TX the messages sent to the ATMBUS will be received as an echo on the serial port This could be an advantage c2. ATMBUS User s Manual 2015 AUTOMATROM SRL www automatrom ro All rights reserved Table of Contents 1 ATMBUS general Information sens 3 gg NAS NN EE EE 3 1 2 Hardware du le EENEG 3 1 3 MR Eeler Te el EE 4 1 4 ATMBUS CRC calculation exvample ren 4 1 5 Possible architectures for ATMDUG iii 5 2 RS232 TO AIMBUS un ele E EE 6 2 1 General INMTONMANON DEE 6 3 ATMBUS MDB MASTER module iii iiiiieiiieeceuereeeeeeeeesesse 7 Kg EECH RT Lee EE 7 3 2 Connecting ATMBUS MDB MASTER module 8 3 3 Message headers ie 9 1 ATMBUS general Information 1 1 What is ATMBUS ATMBUS interface were developed for quick an easy vending development ATMBUS makes the vending development very fast and easy both on hardware and software levels This architecture is mainly created from many diferent hardware modules that can be used to control payment systems I O devices LCD displays and more over a single serial port using a master module or even a PC or SBC Raspberry PI Banana PI etc The bus can be connected to a PC or SBC using a single RS232 port each module recognizing only the messages that are addressed Any project can be easily developed starting with a simple vending dispenser and up to very complex vending machines using Android tablets Raspberry Banana PI touch screens printers bar code scanners etc 1 2 Hardware structure Physically ATMBUS is connected using a 2x5 pin connector with standard 2 5
3. ER This device can also act as an ATMBUS master because it is equipped with a PIC Microchip 18F26K22 microcontroller First function of this device is to convert ATMBUS signals to MDB signal Beside that it also provides the following low level functions Automatic CRC calculation for sent MDB messages The user application does not need to calculate the CRC for sent messages This function is included in the board s software Automatic CRC calculation for received MDB messages The board automatically extracts and verify the CRC on the messages received from MDB peripherals Then it returns to the host the received message without MDB CRC Automatic ACK NACK for MDB peripherals The board will automatically ACK or NACK to the peripheral based on CRC in the critical time of 5ms which is considered NACK for the MDB devices Automatic 9 bit manipulation The board will set or unset the mode bit for MDB peripheral according to the message received from the host The user s application does not need to handle this bit The communication between the host and the board is based on standard 8 data bit communication 3 2 Connecting ATMBUS MDB MASTER module The board is connected to the system using J5 MDB master connector EXPBUS ATMBUS connector J2 MDB payment systems power connector J1 5VCC power only mini USB connector with no USB communication d O NM lt lt lt non fa amp roo h O BUS MDB
4. _ v1 D is vendingtools ra r lt 2 D Q He B IES ee ig ea P eo e ss HG RR ce 910 R53 Fig 4 Board connectors Pin Mode Function OUT 12 24VCC alimentare sisteme de plata MDB GND GND GND OUT GND semnal MDB MDB TX transmisie spre bus ul MDB MDB RX receive from MDB bus DO an HR ON gt OUT MDB sleep mode not used in this application Table 5 J5 MDB connector Pin Function Pin Function Bus DATA 6 N C N C 7 N C N C 8 N C GND 9 5Vc GND 10 N C Table 6 EXPBUS Pin Type Function IN Payment systems power supply 12Vcc or 24Vcc according to your payment systems need GND GND Payment systems GND for power supply Table 7 J2 Payment systems power Pin Type Function 1 IN Board power 5Vcc if the board is connected to a not powered ATMBUS connect a 5Vcc power supply to this connector only if the bus is not powered withit other module 2 N C Not used 3 N C Not used 4 N C Not used 5 GND GND Table 8 J1 5Vcc power supply 3 3 Message headers The host should manage the MDB protocol according to NAMA MDB specifications There are two headers in the communication with ATMBUS TO MDB module All messages sent by the host must start with MDBSW header All messages received by the host from the module w
5. ill start with MDBRW header For example below you can find a dialog with MDB bill validator In this example HOST is the RS232 equipped device PC PLC SBC or an ATMBUS module with master capabilities and MODULE is the ATMBUS TO MDB module HOST MDBSW lt 0x33 gt lt 0x7F gt Poll the bill validator to obtain JUST RESET MODULE MDBRW lt 0x06 gt lt 0x09 gt lt 0x40 gt JUST RESET message received from the MDB bill validator
6. need 1 5 Possible architectures for ATMBUS ATMBUS modules and peripherals can be used in two big architectures a Using one ATMBUS module as a master b Using a PC or SBC Raspberry PI Banana PI etc as a master For this architecture you must use one ATMBUS TO RS232 interface converter see description on Section 2 ATMBUS modules 2 RS232 TO ATMBUS module 2 1 General information This device is needed whenever you need to connect any ATMBUS module to an RS232 device PC SBC PLC etc The device is powered from the ATMBUS you need at least self powered ATMBUS module or you need at least one external powered ATMBUS module It is equipped with a female DB9 connecotr to connect to an RS232 port and with a 2x5pin 2 54mm pitch to connect to an ATMBUS It is necessary only one RS232 TO ATMBUS module to connect many ATMBUS interfaces 3 ATMBUS MDB MASTER module 3 1 General information This device can be used to send in a very simple manner any command to an MDB bus without any CRC timing or 9 bit complication and receiving the response from any MDB peripheral directly to the host after CRC verification It can be used widely to connect any MDB device coin acceptor bill validator cashless device etc to any RS232 host PC Raspberry Pi Banana PI PLC or using an USB to RS232 converter to any USB host Fig 2 Modul ATMBUS MDB MAST
7. ontrolling the communication verifying the sent messages or simply sniffing the communication for an easier debugging For example if the master PC or SBC is sending the message MDBSW lt 0x30 gt lt 0x30 gt lt 0x4F gt to ATMBUS this message will be instantly echoed back to the master The message received from the ATMBUS module addressed will immediately follow the echo message for example MDBRW lt 0x00 gt lt 0x4F gt meaning ACK from an MDB bill validator which received RESET command 1 4 ATMBUS CRC calculation example For this example we will use a RESET message send to an MDB validator connected to an ATMBUS MDB MASTER module Header Message body CRC ASCII HEX MDBSW lt 0x30 gt lt 0x7 F gt HEX only lt 0x4D gt lt 0x44 gt lt 0x42 gt lt 0x53 gt lt 0x57 gt lt 0x30 gt lt 0x7 F gt Table 4 ATMBUS CRC calculation example lt 0x4D gt xor lt 0x44 gt xor lt 0x42 gt xor lt 0x53 gt xor lt 0x57 gt xor lt 0x30 gt lt 0x7F gt If the message CRC is correct the addressed module in our example the MDB MASTER module will receive the command send it to the MDB peripheral receive the response from the MDB peripheral and answering to the ATMBUS If the CRC value is incorrect then there will be no answer on the ATMBUS Each module type has a dedicated header for received messages and for transmitted messages For details about header please see the section for the module you
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