> 4 | Auxiliary Equipment for Software Download

> 4.1 | Download Cable

> This section provides the schematics of a universal RS232 download cable usable for all types of Siemens GSM modules and all download options described in this document for ASC0 and ASC1.
> Figure 9: Schematics of download cable
> The box shown in Figure 10 is an example made of commercially available components. It is not available as a Siemens product.
> Figure 10: Practical sample of download cable