Communication problem with Sabroe UNISAB II

[Zangetsu]

Dear Sirs, I'm facing a problem to communicate with UNISAB II compressor system from Sabroe (Johnson Controls). I want to monitor the data coming from UNISAB II on IGSS SCADA system. there's an already installed driver on IGSS for it but it needs a converter aclled COMSAB from Sabroe too, but it costs a lot amount of money. is there any other way to read the data from UNISAB II such as using RS232 using any other less price converter and interfacing software? Please advice me. Best Regards Zangetsu