11
Jumper settings
Table 6. shows information about the interface conditions
that can be selected using jumpers. In all cases, ON denotes
the connection of the jumper (covering both terminals),
while OFF denotes the disconnection of the jumper.
Table 6. Jumper settings
Note
If the host computer is not equipped with a power supply
for the Current Loop interface, set jumper J1 to ON and also
connect "TTY -TXD Return" to Signal Ground (pin No.7) of
the interface card.
Jumper
Function
Factory
setting
J1
ON: Pulls up "TTY-TXD" to +5v via
200 ohms resistance. (See note)
OFF
J2
JNOR
Flag polarity selection for Current loop.
(See Table 7.)
ON
JREV
OFF
J3
ON: X-ON/X-OFF can be transmitted from
TXD (pin No.2).
OFF: Set TXD to SPACE.
ON