User`s guide

USER’S GUIDE
Appendix–12
Signal Description
Signal Name IN/OUT Explanation
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.