SCU-1600 Control Unit for Turbomolecular Pump
March 10 65 Issue 1-a
5
SERIAL COMMUNICATION PROTOCOL
5 SERIAL COMMUNICATION PROTOCOL
5.1 Introduction
The SCU-1600 is provided with compliant serial interface. Prepare the user application software
according to this instruction manual. Operation instructions and information, such as the running state
and setting values of the STP pump (information which appears on the LCD of the SCU-1600) can be
obtained with the software.
The serial ports located on the SCU-1600 rear panel are called Serial Interface Module (SIM). Refer to
Figure 33.
PC SIM
Figure 33 - Serial communication
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 34). DO NOT connect other pins which are reserved as optional use.
X3A
(D-Sub9 pin, socket)
X3B
(D-Sub9 pin, socket)
2 (TxD) -
3 (RxD) -
RS232
5 (GND) -
7 (D-) 7 (D-) RS485
8 (D+) 8 (D+)
Reserved 1, 4, 6, 9 1, 2, 3, 4, 5, 6, 9
Table 17 - X3A/X3B pin position
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