QVS Interface Converter IC-485S - Manual (Page 10)

IC-485S/IC-485SI OTHERS
4 OTHERS
4-1 TERMINAL BLOCK DEFINITION
The four screw terminal block has different defi-
nition in different operation modes.
In the DCE/DTE mode, the terminal #l (+V) and
#2(-V) are configured to transmit data, the transmit-
ter; the terminals #3(-V) and #4(+V) are configured
to receive data, the receiver.
In the MONITOR mode (for IC-485S only), the
terminals #l and #2 are respectively the positive and
negative of receiver #I; the terminal #3 and ##4 are
the positive and negative of receiver #2.
OTHERS IC-485S/IC-485SI
4-2 SELF TEST
To test the internal circuit of the interface con-
verter, connect a dumb terminal to the unit and proc-
ess as follows:
1. Set SW1 to DCE (if the dumb terminal is a DTE
configuration).
2. Set SW2 to TxON, RxON.
3. Connect one wire from Tx+(#l) to Rx+(#4),
and connect another wire from T
X
-(#2) to Rx-
(#3X
4. Set the terminal to full duplex and enter data,
then the data should be displayed on the screen.
Figure 4-l Terminal Block
14 User’s Manual
User’s Manual
5. If this o c c u r s the internal circuit is opera-
tional.
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