Toshiba TRST-A10 SERIES Product Description page 13

1. OUTLINE
(4) DSR
When the DTR/DSR control is selected, the printer confirms this signal is SPACE and then
sends the status data. When it is not selected, the data is sent without DSR.
(5) SG
Signal ground.
(6) CTS
Clear to send. This is asserted by host terminal to acknowledge RTS and allow printer to
transmit.
Pin 2 - Transmitted Data (TxD) This signal is active when data is transmitted from the DTE
(computer)
device to the DCE (printer)device. When no data is transmitted, the signal is held in the mark
condition
(logic '1', negative voltage).
NOTE: Pin 2 on the DCE device is commonly labeled "Received Data", although by the
EIA232 standard it should still be called Transmitted Data because the data is thought to be
destined for a remote DTE device.
Pin 3 - Received Data (RxD) This signal is active when the DTE device receives data from
the DCE device. When no data is transmitted, the signal is held in the mark condition (logic '1',
negative voltage).
NOTE: Pin 3 on the DCE device is commonly labeled "Transmitted Data", although by the
EIA232 standard it should still be called Received Data because the data is thought to arrive
from a remote DTE device.
Pin 4 - Request to Send (RTS) This signal is asserted (logic '0', positive voltage) to prepare
the DCE device for accepting transmitted data from the DTE device. Such preparation might
include enabling the receive circuits, or setting up the channel direction in half-duplex
applications. When the DCE is ready, it acknowledges by asserting Clear to Send.
NOTE: Pin 4 on the DCE device is commonly labeled "Clear to Send", although by the EIA232
standard it should still be called Request to Send because the request is thought to be
destined for a remote DTE device.
Pin 5 - Clear to Send (CTS) This signal is asserted (logic '0', positive voltage) by the DCE
device to inform the DTE device that transmission may begin. RTS and CTS are commonly
used as handshaking signals to moderate the flow of data into the DCE device.
NOTE: Pin 5 on the DCE device is commonly labeled "Request to Send", although by the
EIA232 standard it should still be called Clear to Send because the signal is thought
to originate from a remote DTE device.
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EO10-13009A
1.6 ELECTRONIC SPECIFICATIONS