QVS Interface Converter IC-485S - Manual (Page 5)

IC-485S/IC-485SI INSTALLATION
2-2 SWITCH FUNCTION DESCRIPTION
Refer to the location of the SW1 and SW2, please see
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.
Position 2: DTE means the IC-485 is set at DTE
mode and it must be connected to a DCE
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)
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
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)
Note: DTE means Data Terminal Equipment.
DCE means Data Communication
Equipment.
More detailed information, please refer
to the Appendix.
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