28 Setting Internal Jumpers
Relay Output Signal JMP4 Position
1 PPH A
Programmable Pulse B
Fault (Fail-Safe) C*
Table 5.4: FAULT Relay Output Control, JMP4
5.2.7 JMP6, Output Enable
The factory uses jumper JMP6 for enabling the 5 V CMOS output buffers. For normal operation,
set jumper to position A. Normally, this jumper will be configured as required when delivered from
the factory. Note: JMP6 is located near Pin-40 of U1; however, its reference designation was
inadvertently omitted from the silk screen on some early units.
5.2.8 JMP7, Model 1089A/B/C Timing Input Selection − Obsolete
The Model 1089A/B/C is obsolete and the jumper selection, JMP7, is no longer valid.
5.2.9 JMP9, P2 Output Selection
JMP9 selects the output on P2 between unmodulated IRIG-B and programmable pulse on later
model 1084A/B/C clocks. Clocks dating back to 1996 have the jumper installed.
5.2.10 JMP10, RS-232 DSR or Prog. Pulse Output Selection
Select DSR or programmable pulse on pin 6 of the main serial port by jumper, JMP10. Position
A selects DSR output and position B selects programmable pulse.
5.2.11 JMP11, Model 1089A/B/C − Obsolete
JMP11 may be found on the Model 1084A/B/C main board and is obsolete as it was used in the
Model 1089A/B/C, which is obsolete.
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