AGFA 1200 Owner's Manual page 21

If your scanner is the first external device of your SCSI chain
1 Connect the 50-pin end of the SCSI cable to the connector of the next device in the SCSI
chain.
2 Snap the diamond shaped wire clips into the clip brackets to secure the connection.
3 Connect the 25-pin end of the SCSI cable to the connector of the scanner.
4 Tighten the connector screws to secure the connection.
5 Make sure that the last device in the SCSI chain is terminated.
Chapter 2: Installing the Scanner 21