Olivetti PR4 SR Service Manual
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Contents
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1-10 Service Manual XYAA63361.7 INTERFACES1.7.1 RS-232 Serial Interface Connector Layout• RS232 Connector - PIN functionsPin No Signal name Dir1 Frame GND —-2 TXD OUT Transmitter data3 RXD IN Receiver data4 RTS OUT Fix to ‘Space” level6 DSR IN Space(+12)the host can receive dataMark(-12)the host cannot receive dataWhen DTR/DSR control is selected, the printertransmits data after confirming this signal.When XON/XOFF control is selected, the printerdoes not check this signalIf the signal remains Mark for more than 1msec theprinter performs a reset.(only when selected from set-up)7 Signal GND —20 DTR OUT When DTR/DSR control is selected, this signalindicates whether the printer is busy.SPACE=OK/MARK=busyWhen XON/XOFF control is selected, the signalindicates whether the printer is connected andready to receive data.SPACE=OK /MARK=busyThe signal is always SPACE except during:HW reset, Self test, Set-UP25 INIT IN The printer is reset when the signal remains Spacefor more than 1msec(only when selected from set-up) |
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