Laurel Electronics LAUREATE SERIES COUNTER_TIMER User Manual
Page 44
15.
RS-232 AND RS-485 INTERFACE
15. 1 JUMPER SELECTIONS
RS232 Interface
Jumper g - installed for normal operation
Jumper h - installed when used as a slave display
with the RS232 output of another Laureate meter.
Jumper j - provides a pull-up resistor on the RTS
line.
Note: The board is shipped standard with jumpers g
and j installed
RS232
RS485
RS485 Interface
h
g
j
a
d
c
b
f
e
Note: Bias jumpers b and e must be
installed on board for proper operation. If
the outputs of more than 1 RS485 are
connected together, then 1 (AND ONLY 1)
RS485 board must have the jumpers
installed.
Full Duplex
Jumpers b and e - bias jumpers installed on
1 board
Jumpers a and d - are installed with long cable
runs and add 121 ohm load resistors. If mul-
tiple meters are on same line, only the last
meter in the line should be jumpered.
Half Duplex
Jumpers b and e - bias jumpers installed on 1 board
Jumpers c and f - installed for half duplex operation
Jumper a - is installed with long cable runs and adds a 121
ohm load resistor. If multiple meters are on same line, only
the last meter in the line should be jumpered.
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