To run the 830 with RS232:

Baud: 9600
Parity: No
Stop bits: 2
Data bits: 8
Handshaking: No
inputEos: CR
outputEos: CR

Cable:
db9 DTE   SR830 db25
-------   ----------
   3         2
   2         3
   5         7

Loading the databases, for example:
# Stanford SR830 Lock-in Amp
dbLoadRecords("$(TOP)/30idbApp/Db/SR830.vdb","P=30idb:,N=1,PORT=serial9")
dbLoadRecords("$(TOP)/30idbApp/Db/SR830.vdb","P=30idb:,N=2,PORT=serial10")
dbLoadRecords("$(TOP)/30idbApp/Db/SR830.vdb","P=30idb:,N=3,PORT=serial11")

The arguments for the medm display are simply:
P=xyz:, N=1