Ring Communications DNA200 - Manual (Page 7)

DNA200 OPERATIONS MANUAL 7 2008/05/01
A two twisted pair installation utilizing RS422 signals can be used to connect two devices up to 7000 feet apart.
A strap MUST be installed between RTS and CTS of J2 (DB9), in order to disable flow control for the RS422. To
do this, simply place a strap between pin 7 and pin 8 of J2. You could also solder this strap to a female DB9
connector with solder lugs on the rear, then insert it into the J2 connector.
RS422 Interconnection
Setting Baud Rate / Selecting Device Type
1
2
3
4
5
6
RX-
TX+
TX-
RX+
PTWISTED
PAIR
PTWISTED
PAIR
RX-
TX+
TX-
RX+
RS422
J3
7
8
RS232
J2
RTS
CTS
RS422
DEVICE
7000 FEET MAX.