Honeywell TRS-3300 Installation And Operating Instructions Manual page 12

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As an alternative the front (upper part) of the device can be removed completely for mounting.
d) For this, the cables must not at all be connected, or must be removed (see also step 3b).
e) Unmount the support cable
f) Bend the upper part carefully to the right...
In ex-works condition the side covers are not assebled. If the terminal has already been
completely assembled and in operation, the right side cover must be removed (see
chapter 3.2).
Installation and Operating Instructions TRS 33xx