pcf 8591 i2c bus basic stamp problem

Hi,
I'm trying to control a PCF8591 A/D Converter with my Basic Stamp 2p40 via I2C Bus. Bus is working as I can control a PCF8574 without
problems.
Code is as follows:
I2COUT 8, I2CIdSharpsWrite, I2CSharpsControlByte00, [I2CSharpsControlByte00] I2CIN 8, I2CIdSharpsRead, 0, [B0] I2COUT 8, I2CIdSharpsWrite, I2CSharpsControlByte01, [I2CSharpsControlByte01] I2CIN 8, I2CIdSharpsRead, 0, [B1] I2COUT 8, I2CIdSharpsWrite, I2CSharpsControlByte10, [I2CSharpsControlByte10] I2CIN 8, I2CIdSharpsRead, 0, [B2] I2COUT 8, I2CIdSharpsWrite, I2CSharpsControlByte11, [I2CSharpsControlByte11] I2CIN 8, I2CIdSharpsRead, 0, [B3]
The Constants are correctly defined elsewhere. Now the problem is that all read values contain the result of the AN0-Port of the Device. No other result is read.
I also tried it with AutoIncrement flag set and multiple reads in one I2CIN statement. No chance.
I Think it might have to do with the address information which the BS sends via I2C because the PCF8591 doesn't need any address.
Any Ideas? Working code?
I'm just thinking: Maybe I should put the controlbyte into the I2CIN address location and drop the I2COUT statements. When the PCF interprets the sent 0 address as a control byte then everything is clear. Will try after work...
Code? I2CIN 8, I2CIdSharpsRead, I2CSharpsControlByte00, [B0]
Thanks
Gerhard
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