Ohaus RS422 Interface Option Kit Manual multi - Manual (Page 8)

EN-6 RS485 / RS422 Option Kit
2.9 80500731 Installation in T51XW and T71XW
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 2.6 when performing these steps.
1. Remove the hex bolts from the corners of the rear housing.
2. Pull the front housing forward.
3. Attach the RS485 / RS422 pc board to the rear housing using the two machine
screws supplied.
4. 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. Then skip to step 6.
5. Secure the long cable to the cable tie mount using the cable tie.
6. Remove the hole plug from one of the available strain relief bushings.
7. Feed the communication cable through the strain relief bushing
.
8. Attach the wires of the communication cable to the terminal block on the RS485 /
RS422 pc board.
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 hex bolts.