Frame type/identifier for Xbee series 1

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I am unable to find the User manual for Xbee Series 1. Can anyone point out to the document location. However I could find the datasheet of the same but there is no mention of API frame identifiers in that, like Frame type and Frame ID as 0x10 for transmit request or 0x90 for received data in series 2.

Thanks
Gaurav

http://www.digi.com/support/productdetail?pid=3257