Ohaus RS422 Interface Option Kit Manual multi User Manual
Page 6
EN-4 RS485 / RS422 Option Kit
2.3 80500731 Installation in T51P and T71P
WARNING: ELECTRICAL SHOCK HAZARDS EXIST WITHIN THE
HOUSING. THE HOUSING SHOULD ONLY BE OPENED BY AUTHORIZED
AND QUALIFIED PERSONNEL. REMOVE ALL POWER CONNECTIONS TO
THE UNIT BEFORE OPENING. IF THE UNIT CONTAINS AN OPTIONAL
RELAY CONTROL BOARD, ADDITIONAL AC OR DC POWER
CONNECTIONS MAY STILL EXIST WITHIN THE HOUSING.
Refer to Figure 2.5 when performing these steps.
1. Remove the four screws from the corners of the rear housing.
2. Pull the front housing forward.
3. Remove the plastic hole cover located next to the RS232 connector on the rear
housing.
3. Install the strain relief bushing in the exposed hole.
4. Attach the RS485 / RS422 pc board to the rear housing using the two self
tapping screws supplied.
5. Connect the long cable to connector J1 or J4 on the RS485 / RS422 pc board
and connector J8 on the main pc board.
Note: If the Relay option pc board is already installed, do not use the long
cable. Connect the short cable between the RS485 / RS422 pc board and the
Relay pc board instead.
6. Feed the communication cable through the strain relief bushing and under the
left side of the main pc board.
7. Attach the wires of the communication cable to the terminal block on the RS485
/ RS422 pc board.
8. Position the cable in the slots along the left side of the rear housing.
9. Pull the excess cable through the strain relief bushing and tighten the external
nut on the bushing.
10. Close the housing and reinstall the four screws.