5
X
RS-232,485 + 2
X
E
THERNET
/2 M
BIT
/
S
G.703 (G.704) M
ULTIPLEXER
O
PERATING
M
ANUAL
IOA81-1E
22
August 2004
Figure No. 23 illustrates the position of jumpers for setting the zero modem in the RS-232
interface configuration.
Note: It is very important to set RS-485 terminating jumpers to OFF when setting
the device to RS-232 interface. Wrong positions of RS-485 bus biasing jumpers may
cause improper operation of the RS-232 interface.
Figure 24 shows positions of RS-485 interface terminating jumpers set to OFF. Setting the
termination and bias jumpers to ON is justified only when the type of interface is configured
to RS-485.
Note: In case the interface type is set to RS-485, the DTR
↔
DSR, RTS
↔
CTS, and
DCD jumpers should be removed, otherwise the RS-485 interface may work incorrectly.
TERM
TERM
TERM
Locations of terminating and bias jumpers
of the RS-485 jumpers OFF state
Fig. 24.
Location of jumpers related with termination and bias of the RS-485 bus
Summary of Contents for TM-81.1
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