The Carlo Gavazzi GAP1605 Programming Unit is a portable plug-in unit for programming channel codes on Dupline type G modules. After connecting the cable between the GAP1605 and a Dupline type G module, the 5-key tactile keyboard operates the product with two keys for reading and programming, two keys for changing groups and channels, and one key for selecting the desired input/output. The current coding is displayed by 4 x 8 dot LEDs. The top row of LEDs displays the selected input or output. The two middle rows display the current channel group, and the bottom row displays the current channel code.

The coding of I/Os can be achieved as either 2, 4, and 8 successive channels or individuall for each I/O. Unused inputs/outputs can be defined as non-coded.