Define where "up there" is.
PS ---Melb. is below Syd.
What transfer software do you have ?
using PIP or DNC ?----I'd say you will be using PIP
COM1 plug= ? pins ( 9 or 25 )
RS232 plug at the MC ? ( normally 25 )
PC 25pin --> OSP 25pin is wired differently than PC 9pin
How is your cable wired now ?
Always start by sending a file from the MC to PC
MC has different settings for Reading and for Punching
This is god info (OSP 5000, 5020, and 7000 RS232 Settings from Okuma Support)
but shows only a 25 --> 9 pin layout
for a 25 --> 25 pin the differences are
----PC-pin2 --> OSP-pni3
----PC-pin3 --> OSP-pni2
----PC-pin7 --> OSP-pni7
----no pins need bridging on the PC end
Do you have contact with Okuma Aust. ? Greg W. (apps guy) would be a good start