9KTKPI
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%CDNGU VQ EQPPGEV VQ 06#.' .KPM #FCRVGTU
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:9<6 O
%QPPGEVKQPU VQ C /QFGO
Modem
FG
SD
RD
RTS
CTS
DSR
SG
CD
ST2
RT
DTR
CI
ST1
5GEVKQP
Serial Communica-
tions Board or Unit
RS-232C port
FG
SD
RD
RTS
CTS
5V
DSR
DTR
SG