TINY-2/MICRO-2 Technical Ref., 2. Ed 1989
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TABLE OF CONTENTS
INTRODUCTION ............................................................................... 4
Features ................................................................................ 4
NET/ROM and ROSE Compatibility ........................................... 4
COMPUTER INTERFACING ................................................................. 5
RS-232 Port Signals ................................................................ 5
Nonstandard RS-232C Serial Ports ........................................... 6
Serial Port Operation At TTL Levels .......................................... 7
Serial Data Signal Definitions .................................................. 7
RS-232C Handshaking Protocol ................................................ 9
RADIO INTERFACING ........................................................................ 10
Radio Connector (J2) Pin Definitions ........................................ 10
Direct Connection to Microphone and Speaker .......................... 10
Accessory Jack Connection ...................................................... 11
External Interface Box ............................................................ 11
HARDWARE DESCRIPTION ................................................................ 12
LEDs ..................................................................................... 12
Detailed Circuit Description ..................................................... 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 Adjustment .................................................. 18
TROUBLESHOOTING ......................................................................... 19
Loopback testing .................................................................... 20
Analog loopback .......................................................... 20
Digital loopback ........................................................... 20
General Tests ......................................................................... 20
Step 1: Obvious Problems ............................................. 20
Step 2: Power Supply ................................................... 21
Computer Terminal Interface .................................................. 21
Packet Controller won't sign on to the Computer ............ 21
The Controller prints only gibberish ............................... 21
The Controller won't accept commands ......................... 22
