SCU-1601 Control Unit for Turbomolecular Pump
SERIAL COMMUNICATION PROTOCOL
5.2 Connection and setting up
5.2.1 Signal connection
The STP control unit is equipped with 3 serial ports COM1, COM2 and STP-Link as a standard.
Details of the serial ports COM1 and COM2 are as follows:
1. Serial Port COM1 (shared use by the RS232/485)
Connect the PC serial port to connectors X3A or X3B (a D-Sub9-pin, socket) on the rear panel.
Connect TxD/RxD/GND in the RS232 and D+/D- in the RS485 in accordance with Table 17 (refer to
Figure 39). DO NOT connect other pins which are reserved as optional use. DO NOT use a
commercially available straight cable which all lines are connected.
Table 17 - X3A/X3B pin position
Figure 39 - Connector X3A/X3B (D-sub 9)
Note: The connectors X3A and X3B are fitted using M2.6 screws.
RS232 and RS485 cannot be used at the same time. The factory setting is RS232. When connecting
RS485, the change of communication parameter setting is required, refer to Section 3.11.
When connecting RS232, the length of the communication cable should be 15 m or less. When
connecting RS485, refer to Section 5.2.2.
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