QVS IC-485SI ユーザーズマニュアル
IC-485S/IC-485SI
INSTALLATION
2-2 SWITCH FUNCTION DESCRIPTION
Refer to the location of the SW1 and SW2, please see
Figure 1- 1.
Figure 1- 1.
IC-485S:
IC-485SI:
SW 1: Device Mode Selection
Position 1: DCE means the IC-485 is set at DCE
mode and it must be connected to a DTE
device.
device.
Position 2: DTE means the IC-485 is set at DTE
mode and it must be connected to a DCE
device.
device.
Position 3: Monitor means the IC-485S is set at
monitor mode and it is used to monitor
User’s Manual
User’s Manual
INSTALLATION
IC-485S/IC-485SI
the RS-485 line signals (for IC-485S
only).
SW2: Transmitting and Receiving mode selection
Position 1: (TxON, RxON) means the IC-485 is
always in transmitting mode and in re-
ceiving mode.(using in Point-to-Point
mode)
mode)
Position 2: (TxRTS, RxRTS) means the K-485 is in
transmitting mode while RTS signal is at
high level and it is in receiving mode
while RTS signal is at low level.(using
while RTS signal is at low level.(using
in Multidrop mode)
Position 3: (TxRTS, RxON) means the IC-485 is
always in receiving mode and it is in
transmitting mode only while RTS sig-
nal is at high level.(using in Multidrop
mode to monitor the RS-485 line signals)
nal is at high level.(using in Multidrop
mode to monitor the RS-485 line signals)
Note: DTE means Data Terminal Equipment.
DCE means Data Communication
Equipment.
More detailed information, please refer
to the Appendix.
to the Appendix.
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