Data Communications Pocket Book by Michael H. Tooley

By Michael H. Tooley

A guide on facts communications masking neighborhood zone networks (LANs), Ethernet, the structure of I/O units, parallel and serial info conversion, good judgment circuits, fibre optic expertise and extra. equipped for fast reference, it really is geared toward readers from the subtle to the non-technical

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Notes: CTRL is often represented by the character '* '. Hence CTRL-A (control-Α) may be shown as "A 2. VWhen entering control characters from a keyboard, the control key (CTRL) must be held down before the other keyboard character is depressed 3. CControl characters can usually be incorporated in BASIC programs by using statements of the form: (L)PRINT CHR$(n). To produce condensed mode printing on an EPSON printer, for example, the following BASIC statement is used: LPRINT CHR$(15). 1. C Decimal, binary, hexadecimal and A S C I I conversion table / 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 / 00000000 00000001 00000010 00000011 00000100 00000101 00000110 00000111 00001000 00001001 00001010 00001011 00001100 00001101 00001110 00001111 00010000 00010001 00010010 00010011 00010100 00010101 00010110 00010111 00011000 00011001 00011010 ft 00 01 02 03 04 05 06 07 08 09 OA 0B oc 0D 0E OF 10 11 12 13 14 15 16 17 18 19 1A NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT FF CR SO SI DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB 38 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 Decimal, binary, hex and ASCII conversion table / 00011011 00011100 00011101 00011110 00011111 00100000 00100001 00100010 00100011 00100100 00100101 00100110 00100111 00101000 00101001 00101010 00101011 00101100 00101101 00101110 00101111 00110000 00110001 00110010 00110011 00110100 00110101 00110110 00110111 00111000 00111001 00111010 00111011 00111100 00111101 00111110 00111111 01000000 01000001 01000010 01000011 01000100 01000101 01000110 01000111 01001000 01001001 01001010 01001011 01001100 01001101 01001110 01001111 01010000 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B AC 4D 4E 4F 50 ESC FS GS RS US SP ι # $ % & ( ) * + / 0 1 2 3 4 5 6 7 8 9 < > ?

In addiiton, extra lines to I/O lines are normally available to facilitate handshaking. This provides a means of controlling the exchange of data between a computer system and external hardware. The nomenclature used for parallel I/O lines and their function tends to vary from chip to chip. The following applies to the majority of devices: PAO to PA7 CA1 to C A 2 PBO to PB7 CB1 to CB2 Port A I/O lines; 0 corresponds to the least significant bit (LSB) whilst 7 corresponds to the most significant bit (MSB) Handshaking lines for Port A ; CA1 is an interrupt input whilst C A 2 can be used as both an interrupt input and peripheral control output Port Β I/O lines; 0 corresponds to the least significant bit (LSB) whilst 7 corresponds to the most significant bit (MSB) Handshaking lines for Port B; CB1 is an interrupt input whilst CB2 can be used as both an interrupt input and peripheral control output.

The bus will remain in the configured state until it is reconfigured eg C O N F I G T A L K = 2 L I S T E N = 1,3,4 configures device number 2 as a talker and devices 1, 3, and 4 as listeners ENTER Enters bus data from the selected device into a specified string array (the array must have been previously dimensioned). A flag (FLAG%) will contain any error codes returned eg E N T E R 10[$, 0, 15] enters data from address 10, array elements 0 to 18 EOI Sends a data byte to the selected device with EOI asserted.

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