JUMO variTRON 500 Montageanleitung Seite 64

4 Retrofitting interfaces
Opening the housing
(A)
1. Loosen and remove terminal strip (A), if not already done during shutting-down.
2. Loosen all locking hooks (B) one after the other using a screwdriver. To do this, insert the screwdriver
into the small slot (C) below the locking hook and turn carefully (maximum 90°). When doing so, pull
the housing parts slightly apart so that the locking connections can be released.
3. Remove the upper part of the housing.
Retrofitting an RS232 or RS485 interface
1. Carefully move module for Com1 (D) or Com2 (E) into position until the plug-in connection is con-
nected.
2. Fasten the module with the enclosed screws (tightening torque 0.7 Nm).
3. Use a screwdriver to remove the blind cover (F) of the relevant interface in the upper part of the hous-
ing. In case of an RS485 interface, also remove the blind cover (G) for the switches of the terminating
resistors.
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(B)
(C)
(D) (E)
(B)
(B)
(B)
(G)
(F)
(G)
(F)
(B)
(B)
(B)