Laurel-electronics LAUREATE SERIES COUNTER_TIMER Manuel d'utilisateur télécharger pdf (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

dcb

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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Laurel-electronics LAUREATE SERIES COUNTER_TIMER Manuel d'utilisateur Page 44