Advertisement
RS-232
Computer
Connect a 120
ohm resistor if the
converter does not
.
provide this
•
If more than 32 units or longer than 4000 feet is connected to the system, an RS-485
repeater is required.
•
A connection to ground for each MDS636 is recommended.
Computer
RS-232
Communication Wiring Diagram
485 Converter
Set to DCE mode
T-RTS & R-/RTS
T- R- T+ R+
MDS636
Unit 1
485 +
485 -
Modem Connection Diagram
Telephone Line
Modem
RS-485 converter that:
1.
Can be set to DTE mode or needs special
wiring to the modem.
2.
Can switch data flow direction itself.
MDS636
Unit 2
485 +
485 -
Jumpers must be installed at positions 7, 8,
and 9 on header H1 on back of MDS636 pc
board on the last unit only.
RS-485
Converter
Modem
6
MDS636
Unit 32
485 +
485 -
485 +
485 -
MDS636
Unit1
485 +
485 -
Advertisement
