your wallet on the host computer has a .conf file im sure youve setup before... user, password, port, usual stuff. you can add
allowip=<ipaddress of pi miner on local network>
setup your miner to point to
-o
http://ip.address.of.hostcomputer:port -u user -p password
for windows 7, folder %appdata% > scryptcoin > text file renamed scryptcoin.conf saved as "all types" filetype
server=1
listen=1
rpcuser=<user>
rpcpassword=<password>
rpcport=<port> *invent as necessary
rpcallowip=<ip address of local network miner>
addnode=<nodes as needed>
for the miner .bat file or miner start minimum,
cgminer --scrypt -o
http://ipaddressofhostwallet:port -u user -p password - any extra flags for your miner settings for speed temp etc etc
hope this works, if not well im sure there will be other responses