WTDIO-M
Contents
1. AL Xx gt o a DIGITAL I O MODULE WTDIO M J4 CB 5 5 Ji 1 iuF Com Xmit Rec ice ree O o c4 cs 414 o E el ol luF uf A ce O jo L 1uF j O E 4 Ze ae M E o ifci ucc 1 L O D 3 Ci E cat u TE g al C2 ND CH E A is lz RC Rcapt E Ret Red Pos F a 13 PS Th 1N4148 A Ros rs o E e f sch RAS EI 1 SC G es E o re 8 3 M lileca RB2 4 D z Kee Rs232 TIL rea O H 3 EI SUE 7 1o 1N4148 ziloa fee Lee be a e D Wa Ree Lee lol O I P E el ol RET T E o EE 101 2bhosci Rag z MAXZ3Z 10 loscz Raz bd q ik Truss ras Le A2 L 0 vss Ras E Cl IUI see Be L T 103 Oli ae ae PIC16F88Z S I S 78L 5 ZE TI 5 Si R2 O H O 1N4881 1 A 3 HSB 396K 3 pt vin gues i 1 CN z e HO q 7 O su S 5 E c1 cz c3 O enD O 47uF B 1uF 16uF LSB Address Copyright 2000 2008 by Weeder Technologies2. eeder Technologies 90 A Beal Pkwy NW Fort Walton Beach FL 32548 WTDIO M www weedtech com Digital I O Module FEATURES e 14 UO channels individually configured for input or output All inputs incorporate a pull up resistor to 5 volts simplifying hookup to switch contacts DIP switch addressable stack up to 32 modules on the same port for 448 I O points e Outputs can sink source up to 25 mA each Responds to button presses and switch transitions using automatic debounce and typematic repeat with adjustable delay Decodes 4x4 matrix keypad using auto debounce and typematic repeat e Turns on off relays triacs switching transistors etc One shot pulse output with software programmable length of 10 to 655 350 uS e Industry standard RS 232 interface Meets all EIA TIA 232E and V 28 specifications e Wide power supply range 8 to 30 VDC e Screw terminal connectors used on all inputs and outputs DESCRIPTION Connects to the RS 232 serial port of a PC laptop or other host Enables software programs to interact with the hardware of a mechanical world via 14 distinct digital logic input output channels Uses include industrial automation process control alarm security home automation remote data entry retrieval keypad access systems etc Easy to use command set minimizes user learning curve but preserves a robust feature rich functional environment Ideal for quick set up
3. check the current state of an output as well as read an input WRITE Writes data to the I O channels as a 4 8 12 or 14 bit parallel port The data must be in hexadecimal notation from 0 to 3FFF The number of characters nibbles in the data field determines how many channels are changed to output and manipulated For example if data F channels A D will be set high all other channels will not be effected In contrast if data 000F channels A D will be set high and channels E N will be set low INPUT Sets the specified I O channel or multiple parallel port channels to a high impedance state input and cancels any other Copyright 2000 2008 by Weeder Technologies Rev K Weeder Technologies function SWITCH BUTTON or MATRIX assigned to that I O channel s The READ command can then be used to retrieve data from external logic sources Note this is the natural state of all I O channels upon power up or after a power disruption or brown out TYPEMATIC Sets the typematic repeat delay of a specific I O channel which will be used when that channel is configured for BUTTON or MATRIX functions ECHO Turns on or off the confirmation echo which is used to verify reception of a command If reception confirmation is not needed turning ECHO off will increase the repetitive rate at which the host can manipulate the I O channels ERROR Any data string sent from the host containing the correct header characte
4. important in WTDIO M order to allow the WTDIO M to respond to multiple switch closures on a single I O channel even though the typematic repeat delay for that particular channel may be set to a much slower rate To set the typematic repeat delay of the buttons on a matrix keypad work with the I O channels which are setup for input K N These channels correspond to the four columns of the keypad and may be set to different values if wishing to have certain button columns repeat at a different rate then others USING BUTTONS amp SWITCHES To hook the WTDIO M to a button or switch simply run a wire from one contact of the switch to the desired I O channel s screw terminal and a wire from the opposite contact to the screw terminal labeled GND A 10KQ pull up resistor is already included on the board for each I O channel so no additional components are required The logic level at the I O channel will be high when the switch is open and low when the switch is closed DRIVING RELAYS The I O channels of the WTDIO M can sink or source only 25 mA This current is insufficient to drive most relays therefore a switching transistor must be used as shown in Figure 2 The voltage applied to V should be that which is necessary to drive the relay and can be the same power source which is connected to the data module or a completely separate supply as long as the ground terminals of the two supplies are tied together Caution DO NOT
5. 0 2008 by Weeder Technologies Page 3 Rev K Weeder Technologies WTDIO M TABLE 3 TERMINAL CONNECTOR DESCRIPTION NAME TYPE ELECTRICAL SPECS COMMENTS DB RS 232 serial port configured as DCE HOST Gen EIA TIA 232E Standard Connects to host PC Hardware handshake jumpered DB RS 232 serial port configured as DTE Can SLAVE E EIA TIA 232E Standard be connected to another data module s HOST port for networking Power Power source selection jumper Selects Source Jumper Ke either external or port powered Note 1 Screw Term 8 to 30 VDC External unregulated power supply input Screw Term GND External power supply ground Se If configured as input will decode logic A N Scen lem a zi a Ge ie SE a levels All channels incorporate a pull up Input Wage 0 3 to 5 3V Note 2 resistor to 5 volts which will hold it high if left 50 910 9 0 Note2 open A G Schmitt Trigger H N TTL A N Screw Term VoL 0 to 0 6V VoH 4 3 to 5V If configured as output will change logic Output Sink Source 25mA Note 3 state upon command 5 Screw Term 5V lt 100 mA Regulated 5 volt output GND Screw Term GND Logic ground Note 1 Selecting port powered will draw from the power supply source of an upstream data module Caution the COM port of a PC or laptop does not supply enough current to serve as the power supply source Note 2 Due to internal 20 mA clamping diodes a series input resistor
6. FFF Make required number of channels an output see text and writes MIE ees data to them as a parallel port data 0 to 3FFF A LSB Note 3 INPUT enn If chn A N make channel chn an input If chn P make 8 bit port channels A H an input If chn omitted make all an input Note 3 Sets the typematic repeat delay for a specific input channel which will be used for BUTTON or MATRIX functions chn A N time 1 to 15 TEINS Taas listed in 1 10 of a second Default 3 0 3 sec If time 0 typematic repeat disabled If time omitted reads the current setting Note 3 ECHO Viale Turns on or off the reception confirmation echo Value 0 or 1 0 off 1 on default 1 If value omitted reads the current setting ERROR This character will be returned after an invalid command or variable RESET This character will be returned after a power on reset or brownout Note 1 All command strings sent to the data module should be preceded with the header character see Table 1 and terminated with a carriage return All responses from the data module will also appear in this format Note 2 Any spaces shown above in the listing of the command strings are for clarity only They should not be included in the actual transmission from the host nor expected in a response from the data module Note 3 If ECHO is on after successful execution this command will be echoed back to the host in the same format as received Copyright 200
7. able diagnostic tool when troubleshooting communications problems WTDIO M FIGURE 1 MODCOM APPLICATION Re lit Fie Edit View Page Communicate Run loop Place Object Security Help RS e Digital UO Module Right click on any screen objectto edit its properties Unlocked init 14 Log 0 An easy to use Windows software package called ModCom is available and can be downloaded from Weeder Technologies web site This program will allow the user to quickly set up custom buttons which transmit commands custom windows that poll for data and a variety of other screen objects such as slider controls event counters amp timers bar graph level indicators button selection arrays and more In addition conditional statements can be set up to take action when specific events or conditions are met sequences can be written and then called by other screen objects during run time and data can be logged to a file automatically at user defined intervals Once ModCom is installed and running go to the lt Communicate gt menu item at the top of the screen and click on lt Send Receive gt A dialog box will pop up which you can use to type in the commands from Table 2 transmit them directly to the data module and see the response coming back Use this dialog box to familiarize yourself with the command set and to experiment with the various features supported by the module The experience gained he
8. alue assigned to the time variable is multiplied by 10 when loaded BUTTON Configures the specified I O channel to sense and respond to a low going transition such as the press of a normally open button wired to ground A built in debounce feature is used to mask multiple transitions produced by contact bounce The response character string TABLE 2 COMMAND SET will be retransmitted at a rate determined by TYPEMATIC while the button is held down TITLE COMMAND DESCRIPTION HIGH Ganime Make channel chn an output and set high for time x10 microseconds chn A N time 1 to 65535 If time omitted chn remains high Note 3 LOW L chntime Make channel chn an output and set it low for time x10 microseconds chn A N time 1 to 65535 If time omitted chn remains low Note 3 Make channel chn an input and respond to button press Returns SIT Sen chn L when pressed Repeated if held down chn A N Note 3 Make channel chn an input and respond to switch transition Returns Sal SS chn L or chn H when toggled chn A N Note 3 MATRIX M Use channels G J as outputs and channels K N as inputs to decode a 4x4 matrix keypad Returns M row col row G J col K N Note 3 If chn A N read state Returns chn H or chn L If chn P read READ R chn channels A H as an 8 bit parallel port A LSB Returns 00 to FF If chn omitted read all channels as parallel port Returns 0000 to 3
9. and run applications Voice Fax 850 863 5723 SPECIFICATIONS Digital Inputs Buffer Type Digital Outputs Output Current Processor Clock Communications Power Requirements Current Draw Operating Temperature Board Dimensions Weight Up to 14 accepting 5V logic signals 7 use Schmitt Trigger 7 use TTL Up to 14 generating 5V logic signals 25 mA max per chn 90 mA total source 90 mA total sink PIC16F882 4 MHz 9600 Baud N 8 1 8 to 30 VDC 13 to 26 mA plus any output drive current 20T to 80T 3 1 x 2 0 x 0 7 1 8 oz Copyright 2000 2008 by Weeder Technologies Rev K Weeder Technologies TABLE 1 ADDRESS SETTING HEADER DIP SWITCH CHARACTER SETTING ASCII HEX 1 on O off Bs RATES A 41 00000 B 42 00001 C 43 00010 D 44 00011 E 45 00100 F 46 00101 G 47 00110 H 48 00111 1 49 01000 J 4A 01001 K 4B 01010 L 4C 01011 M 4D 01100 N 4E 01101 O 4F 01110 P 50 01111 a 61 10000 b 62 10001 c 63 10010 d 64 10011 e 65 10100 f 66 10101 g 67 10110 h 68 10111 i 69 11000 j 6A 11001 k 6B 11010 6C 11011 m 6D 11100 n 6E 11101 o 6F 11110 p 70 11111 WTDIO M STACKABLE DATA MODULES All modules in this series incorporate two EIA TIA 232E serial ports which communicate at 9600 baud no parity 8 data bits a
10. essage to their windows To view or edit these conditional statements go to the lt Run Loop gt menu item at the top of the screen and click on lt Conditionals gt Refer to the help files for more information CONTACT DEBOUNCE A typical switch or button uses metal plates called contacts which can be moved together or apart in order to make or break the current path During switch closure when these plates first make contact with each other they will bounce several times before coming to rest This bouncing of the contacts will appear as multiple transitions to a digital system and in most cases not be desirable Each I O channel of the WTDIO M incorporates its own debounce timer used to mask these multiple transitions by disabling the input for a short period of time after each logic state change When an I O channel detects a change of state the action is immediately reported to the host its debounce counter is loaded with a time value equal to 100 mS and the input is disabled until this time period has lapsed Because each UO channel s timer operates independently of each other the WTDIO M can still report actions on additional inputs while its waiting for one or more debounce timers to expire TYPEMATIC REPEAT In addition to the debounce timers mentioned above each I O channel has its own typematic repeat timer which operates both independently of each other and independent of its own debounce timer The later being
11. nd 1 stop bit DB9 connectors are jumpered to satisfy hardware handshaking The port labeled HOST is configured as a DCE device and should be connected to a PC s serial port The port labeled SLAVE is a DTE device and can be left open or connected to another module s host port Up to 32 modules can be chained together in this fashion to form a network Either plugged together end to end or separated by a cable Because a module contains two individual bi directional ports which pass data through it also acts as a repeater extending the total allowable length of the RS 232 communications line A modem can serve as the host for remote operation but since a modem uses a DCE port a null modem adapter must be placed between the modem and the data module s host port A gender changer may also be required In addition any hardware software flow control must be disabled in the terminal program Each module in a network should be set to a different address using the on board 32 position DIP switch A module will only respond to data packets that begin with its own unique header character which is determined by this DIP switch setting See Table 1 Data packets transmitted by a module will also begin with this header character The host PC can use the header character to address each individual module in a network and to identify a module which is talking COLLISION CONTENTION The utilization of the communicati
12. ons line can be thought of more as a single bi directional data bus operated in a multi drop mode rather then a standard RS 232 data link A transmission from a data module travels in both directions upstream to the host and downstream to signal other modules that it has seized the line Before transmitting a module will listen to the communications line and wait for quiescence After a silent period equal to the length of one byte the waiting module will send its data packet using a Carrier Sense Multiple Access with Collision Detection communications protocol See the application note AN100 at the back of this manual for more details EE Copyright 2000 2008 by Weeder Technologies Rev K Weeder Technologies COMMAND SET The host PC communicates with the Digital I O Module using a command set comprised of standard ASCII character strings as depicted in Table 2 Each I O channel will be configured as either an input or output depending on the need of the particular function evoked by the reception of a command string A detailed description of each command and configuration follows HIGH LOW Changes the specified I O channel to an output if not already and sets it to the desired logic state The I O channel can be WTDIO M instructed to remain at this new state or simulate a one shot multivibrator and return to the original state after a user defined time out period in the range of 10 to 655 350 uS Note the v
13. r but an invalid command or variable will be responded to with this error indicator RESET Upon power up or any other reset condition this indicator is transmitted to the host If a data module encounters an unintentional reset due to a power disruption or brown out all configuration info will be lost Therefore upon reception of this indicator the host should retransmit any configuration information originally sent at the start of the operating program OPERATION To hook the data module to a host PC use a standard RS 232 cable with male and female DB9 connectors on opposite ends This cable should be wired straight through pin to pin with no crossover of the data lines In other words not a null modem cable Connect a suitable DC power source to the and terminals of the data module It is highly recommended to use an ungrounded AC adapter such as that which is available from Weeder Technologies This will provide isolation and prevent ground loops which are commonly created if the power supply and computer are grounded at different points When the data module is first powered up the red LED will flash briefly This indicates that the on board microcontroller has booted up successfully completed its internal diagnostic test and has transmitted the reset character to the host to signal that it is up and running The red LED will also flash anytime the module receives or transmits any data packet thus making it a valu
14. re is significant since these are the same command strings you will use when setting up the other objects in ModCom To operate the Digital UO Module start with the sample application WTDIO mod which can be found in the ModCom_ subfolder called Samples After this file is opened it will appear as shown in Figure 1 To start the main run loop click on the green toolbar button at the top of the screen At this time ModCom will transmit a series of initialization commands found in the lt Run Loop gt lt Initialization gt menu item to the WTDIO module to set up its I O channels for the Copyright 2000 2008 by Weeder Technologies Rev K Weeder Technologies various functions shown on the screen You can then use the mouse to click on the Push Buttons and control the logic state of the channels which are setup for output and hook up switches to those channels setup for input and experiment with their functions To understand how this application works first halt the run loop by clicking on the red toolbar button at the top of the screen then right click on any screen object to pull up its properties dialog box In this box you will be able to view the commands which the Push Buttons use to control the output channels or view the input strings which the Event Counters and Event Timers watch for to control their operation Channels G and H use conditional statements to detect a switch transition and send the appropriate m
15. use the 5 volt output of the WTDIO M as your relay power source FIGURE 2 HOOKING UP TO RELAYS V Relay coil 1N4001 To I O Channel 2N2222 or equivalent Copyright 2000 2008 by Weeder Technologies Rev K Weeder Technologies WTDIO M Address Setting Trans Rec Indicator LED This DIP switch sets the Flashes whenever there is address of the Data Module communications between and determines the header host PC and Data Module character of its data packets RS 232 RS 232 Slave Port Host Port Connects to Connects to the Host port T the serial of another port of the Data Module host PC 3AVIS O O ABCDEFGH I J K LM N 5 GND Power Source Jumper Draw power from external input terminals or from an upstream Data Module via the host port Power Supply Inputs Will accept any voltage between 8 and 30 VDC 209 OD PLODOOVOOOVOOIIIVIN Digital I O Channels TTL level inputs and outputs which can be individually configured 3 1 Copyright 2000 2008 by Weeder Technologies Page 7 Rev K WTDIO M Weeder Technologies DCE PORT OTE PORT 8 to 34 VOC
16. will increase the maximum allowable input voltage Note 3 Each I O channel can individually sink or source 25 mA Maximum current sunk by all output channels combined should not exceed 90 mA Maximum current sourced by all output channels combined should not exceed 90 mA SWITCH Configures the specified I O channel to sense and respond to a logic transition This can be an SPST toggle switch wired to ground A built in debounce feature is used to mask multiple transitions produced by contact bounce This configuration differs from BUTTON in that it reports both low to high and high to low transitions and does not incorporate the typematic repeat function MATRIX Configures the last eight I O channels to be used to automatically scan and decode a 4x4 matrix keypad To hookup to a keypad connect channels G J to the keypad s row contacts and channels K N to the keypad s col contacts When a button is pressed the row and col channels which make contact are reported to the host A built in debounce feature is used to mask multiple transitions produced by contact bounce The response character string will be retransmitted at the rate determined by TYPEMATIC while a button is held down READ Reads the logic state of a specified I O channel or reads multiple channels as a parallel port in hexadecimal notation Note this command will not change the direction input or output of a channel therefore it can be used to
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