Secure Meters Ltd. Offers RS232 to RS485 Converter. Secure Meters Ltd. Is an ISO: 27001 and ISO: 14000 certified company. RS232 to RS485 Converter is an interface device between digital energy meter and PC/ Modem. RS232 to RS485 Converter establishes a transparent link for data transfer between multiple meters and base computer software. It is applicable for local and remote meter reading and is suitable for online monitoring systems as well as for sites with multiple meter installation.