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TECHNICAL REFERENCE MANUAL

for

PacComm Packet Controller Models

TINY-2 and MICROPOWER-2

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Summary of Contents for TINY-2

Page 1: ...TECHNICAL REFERENCE MANUAL for PacComm Packet Controller Models TINY 2 and MICROPOWER 2 ...

Page 2: ...cription 12 Modem Disconnect J5 13 ADJUSTMENTS 16 Jumper Functions 16 JP B Lithium Battery 16 JP D NET ROM RFDCD 16 JP L Digital Loopback 16 JP RA Audio Input Impedance 16 JPAux Auxiliary I O 16 JP 8 Power Connection 16 Trimpot Varicap Adjustments 16 Baud Rate Setting 16 Audio Input Level 17 Transmit Level Setting 17 Modem Receive Bias Adjustment 18 Carrier Detect Level 18 Crystal Oscillator Adjus...

Page 3: ...received packets 23 DCD LED flickers excessively or stays on 23 Transmitter locks in transmit condition 23 APPENDICES Node Interconnection Cables 24 Dual TINY 2 MICRO 2 Node 24 Dual Node TINY 2 MICRO 2 and TNC 2 00 24 Triple Node 24 Computer Interfacing Diagrams 25 Radio Interfacing Diagrams 26 RS 232 Signal Table 27 Bit Shifted ASCII Character Table 28 Schematic 29 ...

Page 4: ... previous purchasers Your comments and suggestions for improve ment are welcome Be sure to read any errata manual updates and software release notes before operating the pack et controller Features Firmware Completely TNC 2 firmware Compatible Supports all TAPR commands plus many PacComm additions Personal Message System optional on TINY 2 Hardware NMOS Z 80 CPU and SIO MDLC MICROPOWER 2 CMOS 4 9 ...

Page 5: ...ng a male DE 9 connec tor wired as DCE rather than DTE If you use an AT PC or portable Computer with a 9 pin serial port you can wire cable connector pins 2 through 8 directly pin 2 to pin 2 etc Pin 1 on the TINY 2 MICRO 2 is the Data Carrier Detect DCD signal which goes high true when the packet controller is in the connected state This is analogous to the DCD signal on telephone modems i e the p...

Page 6: ...ent by the computer must be greater than 3 Volts in one state and less than 3 Volts in the other state The polarity of the signals must conform to the RS 232C standard i e the low voltage state is a logical 1 and the high voltage state is a logical 0 Make or buy a cable that provides the following connections The computer serial port common ground pin must be tied to the TINY 2 MICRO 2 serial port...

Page 7: ...s used on the packet controllers serial port connectors Since the pins are defined with respect to the Data Terminal Equipment DTE computer end of the circuit and the packet controller is wired as Data Communications Equipment DCE modem some standard pin names appear to be the reverse of the packet controller function A complete RS 232 signal ta ble appears in the Appendices Serial Port Pin Functi...

Page 8: ...C 200 and relates them to the newer 9 pin connectors used on many modem computers and the TINY 2 MICRO 2 Note that connecting a DTE device to a DCE device using either 25 pin connectors or 9 pin connec tors at both ends of the cable provides a straight through wiring of pin numbers i e connect col umn 1 to column 4 OR connect column 2 to column 3 However when a 25 pin connector and 9 pin connector...

Page 9: ... from the computer Thus data flow from the computer to the packet controller is regu lated by the use of the CTS line The CTS line is always toggled even if software flow control is enabled in this direction If software flow control is preferred or if the computer terminal serial I O port does not imple ment CTS RTS and DTR DSR handshaking then a three wire cable should be used If these RS 232 con...

Page 10: ...INY 2 MICRO 2 to minimize hum or other noise problems Radio Connector J2 Pin Definitions Interfacing the TINY 2 MICRO 2 to a radio involves connecting the following signals at J2 the five pin DIN connector Pin 1 Audio output from the TINY 2 MICRO 2 to the transmitter Pin 2 Ground for both audio and PTT Pin 3 Push to talk to allow keying the transmitter Pin 4 Receive audio from the receiver speaker...

Page 11: ...able If the audio output is squelched or can be adjusted to a low enough level to prevent false carrier detection a direct connection to the TINY 2 MICRO 2 audio input may be made External Interface Box If you desire to use the radio for both packet and voice and the radio does not have an accessory jack and you don t wish to add a connector to the radio you should construct a separate interface b...

Page 12: ...0 SIO 0 8440 06 84C40 06 U14 The 27256 27C256 EPROM 32k bytes U2 contains all the firmware addressed from 0 to 7FFF The 32k 8 RAM U8 holds all buffered data and battery backed parameters for the 8400 06 84C00 06 Z 80 CPU U1 RAM is addressed from 8000 to FFFF Each memory device s chip select is provided by the 74HC139 decoder U3 and the RAM chip select is also buffered by a power failure detection ...

Page 13: ... 5 Volt power The incoming positive voltage is routed through a choke L1 and diode D6 for reverse polarity protection and to the power switch It feeds the 7805 regulator and pin 14 of the MAX231 IC U15 The MAX231 has internal oscillators which allow it to generate a neg ative voltage to support the RS232 levels A voltage approximately one Volt below the incoming supply voltage can normally be meas...

Page 14: ...3 SIO Special Interrupt Input This pin is routed to the radio port DCD input pin on the SIO This pin is normally jumpered to pin 4 when the on board modem is used Pin 4 SIO Special Interrupt Generator Output This signal is an output from the on board modem It is normally jumpered to pin 3 when the on board modem is used Pin 5 SIO RTS Output This signal is used for transmitter activation It activat...

Page 15: ... Receive Clock Input This pin is tied to the SIO receive clock input pin It expects a clock at the desired data rate 1200 Hz for 1200 bauds of the proper phase relationship to the received data This pin is normally jumpered to pin 14 when the on board modem is used Pin 14 Receive Clock Output This pin is the received data clock signal derived from the NRZI to NRZ converter This pin is normally jum...

Page 16: ...be performed with the TINY 2 MICRO 2 removed from its cabinet Remove the packet controller from its cabinet by removing both front and rear end plates and plastic bezels Use caution not to damage the grounding straps attached to some of the end plate screws C17 CPU oscillator frequency R9 Modem bias level R12 Transmit output level R26 Modem carrier detect level Baud Rate Setting To set the baud ra...

Page 17: ...R and the letter K to cause the TINY 2 MICRO 2 to key the radio with a steady tone The high or low tone is selected by pressing the space bar NOTE The watchdog timer will cause the PTT circuit to reset approximately one minute after the K key is depressed If you need a longer adjustment time type Q CR to return to the command prompt and restart the procedure 2 With the TINY 2 MICRO 2 keying the tr...

Page 18: ...adjustment time type Q CR to return to the cmd prompt and restart the procedure 3 Observe the signal output on pin 8 of the TCM3105 U16 with an oscilloscope It may be nec essary to increase the modem output level by adjusting trimpot R12 to get a strong enough signal for decoding The signal should be a square wave Adjust R26 to cause the positive and negative portions of the square wave to be of e...

Page 19: ...the control bus lines especially the chip selects Check each of the 16 address and 8 data lines for activity Any lines showing a lack of activity are not operating properly If you suspect problems with address or data lines try removing all the memory chips Each ad dress and data line will now show a distinct pattern The address lines should be possibly distort ed square waves whose periods increa...

Page 20: ...ove JPR to place the input circuit in a high impedance state Install a homemade jumper be tween pins 1 and 4 of the radio connector J2 Send UI frames and monitor for their reception or try a connection as described above The output level trimpot R12 may have to be turned to near maximum to allow the modem to hear itself Failure of the analog loopback test does not necessa rily mean there is a mode...

Page 21: ...e CTS line at RS 232 connector P4 pin 8 or TTL connector P3 pin 4 is not being held low The packet controller will not send data to the computer unless its CTS line is asserted If the computer does not implement the RTS CTS protocol the RTS CTS lines pins 7 and 8 on P4 should remain unconnected to the computer or else tied to gether Check the baud rates set on the packet controller and computer te...

Page 22: ...y distorted square wave signal Also check for clock signals Z80 CPU U1 pin 6 and SIO U14 pin 20 Verify that the battery backed up RAM protection circuit is working by measuring that pin 28 of the RAM U8 at least 4 7 Volts after input power is applied If the unit is operating and accepting commands from the terminal an overall check of the CPU complex may be conducted using the HEALTH command see O...

Page 23: ...e audio signal from the radio applied to the packet controller or examine the signal with a scope for hum or other noise which might make the packet signals uncopyable Con firm the proper level of the audio signal is applied to the packet controller with a digital meter or scope DCD LED flickers excessively or stays on If the DCD LED flickers on and off excessively or remains constantly on only wi...

Page 24: ...INY 2 MICRO 2 Node Pin Unit 1 Pin Unit 2 2 3 3 2 7 8 8 7 5 9 5 9 Note Lines 7 and 8 are optional Dual Node TINY 2 MICRO 2 and TNC 2 00 Pin Unit 1 Pin Unit 2 2 2 3 3 7 5 8 20 5 9 10 23 Note Lines 7 8 to 5 20 are optional Triple Node Follow the cable assembly instructions in the NET ROM manual substituting pin numbers according to this table TINY 2 MICRO 2 TNC 2 00 2 3 3 2 7 1 7 8 5 9 23 Triple and ...

Page 25: ... 25 Computer Interfacing Diagrams Atari Joystick Port to TINY 2 MICROPOWER 2 TTL Port Tandy Radio Shack Color Computer to TINY 2 MICRO 2 RS 232 Port Commodore VIC 20 C 64 C 128 User Port to TINY 2 MICRO 2 TTL Port Apple Macintosh Computers ...

Page 26: ...Y 2 MICRO 2 RS 232 2 2 3 5 4 3 Tandy Radio Shack Color Computer Radio Interfacing Diagrams ICOM 8 pin IC 27 etc Mic Jack Pinout 1 Data IN 2 GND 3 PTT 4 Data OUT before Squelch 5 Squelch 6 Data OUT after Squelch Mini DIN Data Output of New Transceivers TS 2000 FT 817 etc ...

Page 27: ...w lines must be swapped between a computer and terminal if no modem of other data communications equipment is used These wires are swapped within the cable connecting the two devices This line is called a null modem cable Pin Description 1 Protective Ground 2 Transmitted Data 3 Received Data 4 Request to Send 5 Clear to Send 6 Data Set Ready 7 Signal Ground Common Return 8 Received Line Signal Det...

Page 28: ...ted one place for use in callsign definitions in packet controller EPROMs Format Character ASCII Hex Bitshifted Hex A B C D E F G 41 82 42 84 43 86 44 88 45 8A 46 8C 47 8E H I J K L M N 48 90 49 92 4A 94 4B 96 4C 98 4D 9A 4E 9C O P Q R S T U 4F 9E 50 A0 51 A2 52 A4 53 A6 54 A8 55 AA V W X Y Z space 56 AC 57 AE 58 B0 59 B2 5A B4 20 40 1 2 3 4 5 6 7 31 62 32 64 33 66 34 68 35 6A 36 6C 37 6E 8 9 0 38...

Page 29: ...TINY 2 MICRO 2 Technical Ref 2 Ed 1989 29 ...

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