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USER’S GUIDE
Appendix–12
Signal Description
Signal NameIN/OUTExplanation
FG – Frame Ground
SD OUT Send Data.
RD IN Receive Data. Receives data transmitted
from the computer.
RS OUT Request To Send. “SPACE” level when the
printer is ready to send data to the
computer.
DR IN Data Set Ready. When DSR is at “SPACE”
level, data can be accepted.
SG – Signal Ground
ER OUT Data Terminal Ready. “MARK” level when
the printer is Busy.