Terms used in this book – Gasboy 1000 Series FMS Diagnostic Manual User Manual
Page 11
GASBOY Series 1000
1-2
03/07/03
TERMS USED IN THIS BOOK
The following symbols and terms are used in the diagrams and tables in this book:
COM
Common
NC
Normally closed
NO
Normally open
Rx+, Rx-
RS-422 receive signals
Sig
signal
TB
terminal block
Tx+, Tx-
RS-422 transmit signals
VAC, VDC Volts AC and Volts DC.
A horizontal line appearing above functions indicates that the function is active when 0 VDC is
measured. Any other measurement indicates the function is not active.
___________
POWER FAIL
indicates that when voltage is measured at 0 VDC, a power fail condition is
active.
The following symbols indicate wave patterns you may see when measuring voltages with an
oscilloscope:
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