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How The System Works

The RF Terminal has a 6x24 LCD screen and up to 99 voice messages which can be activated by the host user 
program. Messages from the host user program are written to the serial port to which the applicable Base Station is 
attached. Up to 64 RF Terminals can be controlled by one base station, so the host user program must address the 
applicable RF Terminal by its ID character. When the host receives a message from the Base Station, it will receive 
data with the Terminal ID also included (not true for one-way mode). 

There is no programming on the RF Terminal itself. All programming is on the host computer. Any language and/or 
platform that can read/write to a serial port can easily control a network of RF Terminals. 

Some users will prefer sending the formatting sequences directly over the serial port using the Low Level 
Commands. Others will prefer the Windows ActiveX and TCP/IP controls.

This is How The RF Terminal Operates

Messages from the host user program are sent to the Base Station (via the serial port), then from the Base Station to 
the RF Terminal. The Terminal responds back to the Base with data and its Terminal ID. The data is then 
transmitted from the Base to the host computer where it is processed and the next command is sent out. Each RF 
Terminal has a unique Terminal ID, allowing a single Base Station to handle up to 64 Terminals.

Dialog is established when a Terminal SIGNS ON to the RF network. The host computer application waits until a 
Terminal SIGNS ON, then begins its processing by sending the first prompt out to the Terminal via the Base 
Station. If the Terminal does not receive a prompt from the host, it goes into "sleep" mode, "waking up" and 
checking with the Base periodically to see if it has any messages waiting. This conserves battery power and reduces 
radio traffic.

We have tried to make it easy for the programmer to communicate with the Base Station; no protocol or hand-
shaking is required. This type of communication is fine when the Base is located only a few feet from the serial port 
it is connected to. If you are locating your Base Station farther away, use shielded, grounded (bare wire Pin 1 
touching shield) cable, lower baud rates and possibly, line drivers for very noisy environments.

Before You Begin

Before you begin programming, there are some factors you should take into consideration during the planning 
process.

•

Plan for system failures. This includes hardware failures, software failures and operator failures. In order 
to create an efficient application, you must put some thought into what you will do when different parts 
of the system fail.

•

Look for All Errors. Be sure your program is trapping all possible error conditions that the Base Station 
may return to you. The list includes:

Sequence Errors detected
Illegal Command detected
Base Station Initialized
Addressing a Terminal Not Signed In

Содержание RF Terminal 7000

Страница 1: ......

Страница 2: ...Table of Contents How The System Works Before You Begin Properties Methods Events ...

Страница 3: ... Base Station to handle up to 64 Terminals Dialog is established when a Terminal SIGNS ON to the RF network The host computer application waits until a Terminal SIGNS ON then begins its processing by sending the first prompt out to the Terminal via the Base Station If the Terminal does not receive a prompt from the host it goes into sleep mode waking up and checking with the Base periodically to s...

Страница 4: ...e most frequent failures are at the Terminal level If a Terminal has a hardware failure it will not be able to SIGN OUT It is possible for the Terminal operator to press the ON OFF key or the F1 key by accident forcing the Terminal to SIGN OUT sometimes in the middle of a transaction This happens at battery changing time also You need to plan for partial transactions do you trash the data you do h...

Страница 5: ... method calls make sure to Set the COM port properties device name baud parity bits etc as desired Make sure the port is closed call CloseDevice before making changes to any of the port settings Call the OpenDevice method This activates the COM port used by this instance of the WDterm control Set the ActiveTerminal property to identify the terminal on which you desire to operate You can change the...

Страница 6: ...ly generated The code in the Event Handler is called fired by the drop in component when a specific event occurs An example of an event is when a terminal returns data and the OnTermData event is fired The details of how to access Properties Methods Events varies between development platforms Details of how it works in some of the most popular platforms is illustrated in the samples included with ...

Страница 7: ...etting WDterm may allow other settings but those listed here are the only ones compatible with current version base stations ComDataBits Valid values 7 8 Definition This is a serial port setting and must match the base station setting WDterm may allow other settings but those listed here are the only ones compatible with current version base stations ComStopBits Valid values 1 2 Definition This is...

Страница 8: ...enDevice before other method calls will work DefineFormat 15 Line Terminal Only Parameters font linecount Function This adds a line formatting definition This command is called multiple times to build a display formatting definition for multiple lines which is then sent to the ActiveTerminal by the SendFormat command Font is an integer code 0 small 1 medium 2 large Linecount is a number 1 15 indic...

Страница 9: ...rompt shifted timestamped FG BG Function This instructs the ActiveTerminal to display the prompt at line and position and wait for data to be entered from the terminal keypad only If shifted is set to true the terminal will start in shifted mode Timestamped appends a hhmmss prefix to the returned data FG and BG are ForeGround and BackGround colors for the 7001 15 line terminal See Color Codes Inpu...

Страница 10: ...and position and wait for data to be received through the terminal serial port Waiting for serial input can be bypassed by pressing the enter key on the terminal which will send an empty data string to the host fires the OnTermData event handler FG and BG are ForeGround and BackGround colors for the 7001 15 line terminal See Color Codes OutputSerial All Terminal Versions Parameters data Function T...

Страница 11: ...ts the ActiveTerminal to display date and time on the specified line number Must be followed by an Input method call to take effect Beep All Terminal Versions Parameters count Function This instructs the ActiveTerminal to beep count times Count may be a value from 1 to 9 Must be followed by an Input method call to take effect PlayVoice All Terminal Versions Parameters msgnum Function This instruct...

Страница 12: ...ns Parameters TermNumber Function Returns the actual terminal ID letter code for a given terminal number Use the returned character to match with the Terminal ID programmed into a RF Terminal GetErrCode All Terminal Versions Function Returns code for the most recent error Calling this method resets the Error Code to 0 Error Codes 0 No Error 1 Command Data Too Long 2 Error on Close Device 3 Serial ...

Страница 13: ...before any events can be fired NOTE If you are experiencing problems with exception errors make sure you are not calling any WDterm methods from inside WDterm event handlers Instead use the event handlers to set program variables that are monitored elsewhere perhaps in a timer event handler Call WDterm methods from the monitoring function OnTermBaseRegister Event An attached base station has succe...

Страница 14: ...you have already entered some data on the terminal and press an arrow key this event will not fire See the programming section in the RF Terminal manual for details OnTermLeftArrow Data passed terminal Event The left arrow button has been pressed on a terminal You must issue another Input method call before WDterm can respond to another keypress on the terminal If you have already entered some dat...

Страница 15: ...inal Event The SEARCH button has been pressed on a terminal You must issue another Input method call before WDterm can respond to another keypress on the terminal If you have already entered some data on the terminal and press the Search key this event will not fire See the programming section in the RF Terminal manual for details ...

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