Hasselblad 645 - Manual (Page 134)

Transmitting Data
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Serial In Status
When you select New Images or Previous Image
from the Serial In Mode menu, the Serial In
Status choice becomes available.
1 Select Serial In Status from the Serial Port
menu.
If the connected device is sending data, a
message indicates the most recent data
received.
If there is no device connected or if a
connected device is not currently sending
data, this message appears.