MFJ Multi-mode Data Controller -1278B User Manual page 357

MFJ-1278B MULTI-MODE APPENDIX G: JUMPER FUNCTIONS
Table G-1: Jumper Function (Cont.)
Jumper # Position
JMP18 Pin 1 & 2 (default)
Pin 2 & 3
JMP19 Outside pair (default)
Middle pair
Inside pair
JMP20 ON
OFF (default)
JMP21 Pin 1 & 2
Pin 2 & 3 (default)
JMP22 Pin 1 & 2
Pin 2 & 3 (default)
JMP23* ON
OFF (default)
JMP25 Pin 1 & 2 (default)
Pin 2 & 3
JMP26** Pin 1 & 2 (default)
Pin 2 & 3
JMPA ON
OFF (default)
JMPB ON (default)
OFF
JMPC ON
OFF (default)
JMPD NOT used
JMPE*** ON (default)
OFF
Function
Enable 19.2K baud termial
Disable 300 baud terminal
Enable 300 baud termial
Disable 19.2K baud terminal
Enable 32K mailbox RAM
Enable 128K mailbox RAM
Enable 512K mailbox RAM
512K mailbox RAM installed
32K or 128K mailbox RAM
154 KHz to multi-level PCB
307 KHz to multi-level PCB
Enable CW Grid Block Keying
Enable CW Direct Keying
Enable memory RESET
Normal operation
Normal Demodulator operation
Demodulator Bypass
Normal +5Vb bbRAM operation
Real-time clock installed
Disable multi-gray levels PCB
Enable multi-gray levels PCB
On board transmit low tone
out board transmit low tone
Enable external DCD
Disable external DCD
Disable Low Tone RTTY Demod
Enable Low Tone RTTY Demod