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→A Sample Application
The remainder of this manual explains the various options included in 'the Terminal Emulator II module. The section "Preparing to Send/Receive Data" explains each parameter and tells you how to set up the Home Computer for proper data exchange. The section on "Sending/Receiving Data" provides instructions for beginning data exchange, a description of what is displayed on the screen, and information on terminating data exchange. The "Special Function Keys" section discusses the keyboard overlay and explains how to use the module's many available functions. The "File Transfer" section explains how to transfer files of information between two systems. The last section, "Reviewing Data with the Arrow Keys," explains how to review data stored in your computer's memory.
===Preparing To Send/Receive Data===
To prepare the Home Computer for data exchange, begin by describing the parameters required by the computer system with which you're communicating. The module's default values are shown to the right of each parameter on the COMMUNICATION SETUP display. Check these values against the specifications of your system and the other system. The specifications of your system are provided in the TI RS232 Interface and modem owner's manuals. The other system must provide you with its specifications.
The parameters are as follows:
====Baud Rate====
Baud Rate is the data transmission speed in bits per second. The higher the Baud Rate, the faster the transmission. The speeds you can specify are 110 or 300, as determined by the other computer system.
====Parity====
Parity (ODD, EVEN, or NONE) is the means for detecting any errors which might occur during data transmission from the Home Computer. To ensure proper reception of data, the computer adds the value of the bits transmitted for each character. This sum should be odd for ODD parity and even for EVEN parity.
The type of parity you choose usually depends on the other system. Check the other system's instruction manual for proper selection. If the remote computer does not require a parity bit, select NONE. Note: The module does not check parity for errors in transmission to your Home Computer.
====Duplex====
The duplex setting is a means of transmission between systems which echoes characters back to the Home Computer display. Since the requirements of the other computer system control the duplex setting, check the other system's instruction manual for the proper selection.
FULL duplex means the other system echoes all characters you type back to your display. The HALF duplex setting instructs the Terminal Emulator II module to echo the characters you type back to your display as they are transmitted to the other system. For proper communication between two Home Computers, both should specify HALF duplex. ''Note:'' The TI Telephone Coupler (Modem) should always be set on FULL (switch set to F on the modem).
====RS-232 Port====
This parameter lets you indicate which RS232 Interface port you are using to communicate with the other system. For instance, if your modem cable is connected to port #2 of your RS232 Interface (the port to the right as you face the front of the unit}, select option 2 for this parameter on the COMMUNICATION SETUP display.
====Column Width====
The column-width parameter allows you to set the optimum number of characters per line for your monitor or television screen. A common problem with using a television set instead of a monitor as your video display is ''overscan'' (the loss of characters off either side of the screen). You can avoid overscan by adjusting the column width to suit your television set. As a rule of thumb, the older the television set is, the narrower the column width probably is. If you are using a monitor, the default setting of 40 columns is usually appropriate.
====Auto Log-on====
This feature instructs the Home Computer to send out automatically the control characters that enable your Home Computer to begin data exchange with the other system. The use of this feature requires that: (1) the TI Disk Memory System be attached to your computer and properly turned on, (2) an appropriate log-on data file be stored on diskette (see Appendix C}, and (3) the diskette with the log-on data file be inserted in Disk Drive One (the disk drive that is connected directly to your Disk Drive Controller).
Simply type in the name you have assigned the file (the default file name is LOGON). Next, if you are communicating via telephone, call the other system, correctly place the telephone receiver in the modem cradle, and press '''ENTER'''. If you are not communicating with the other system by telephone, just press '''ENTER'''. After you press '''ENTER''', the logon file is sent out to the RS232 Interface for transmission to the other system. While the transmission is in progress, you may cancel the logon procedure by pressing '''CTRL 3''' (CANCEL).
''Note:'' If the first entry in the input field (the "L" in "LOGON") is a blank space, the module will not search for a log-on file.
If you are not using the automatic log-on feature, press '''ENTER''' to accept the default value LOGON. After a few seconds, the computer beeps, and you may then send the necessary control characters manually.
===Sending/Receiving Data===
After you select the parameters necessary to communicate with the other computer system, you are ready to begin data exchange. As discussed in "A Sample Application," this procedure varies, depending on the system with which you wish to communicate. Check the other system's instruction manual to determine the proper procedure for starting the exchange. If you are using a modem and the telephone network to communicate over a longer distance, include the following steps to begin communication.
:1. Dial the telephone number of the remote computer system.
:2. Verify that the remote computer is ready to communicate (usually signalled by a high-pitched tone).
:3. Place the telephone receiver in the modem cradle. Be sure to align the telephone receiver and its cord as specified in the modem owner's manual. (Note: If you are using the automatic log-on feature, press '''ENTER''' while the cursor is positioned on your log-on file name on the COMMUNICATION SETUP display.)
:4. Begin communication with the remote computer by typing in the codes or other information it requires. These inputs are included with the remote system's instructions. Note: If you are using the automatic log-on feature and the other system echoes the codes that you have included in your log-on file, the codes are displayed automatically as your computer sends them to the other system.
====Data Reception Features====
After you have properly accessed the other system, the display shows the data your computer is receiving. The lines of information appear on the screen one at a time from top to bottom. When the cursor reaches the end of the bottom line, the text scrolls up, one line at a time, and new data is displayed on the last line.
At times, the computer system transmitting data to the Home Computer display may want to clear the display. If the other system sends a control L, the Home Computer recognizes the signal and clears the screen. The cursor automatically moves to the upper left-hand corner of the display.
If the other system wants to move the cursor to the upper left-hand corner of the display ("home" position) and sends a control A or escape H, the Home Computer repositions the cursor. The next data received begins at this position.
