STP-iX457/iXU457 Series Turbomolecular Pump
MT-86E-001-F
Page 70
5
SERIAL COMMUNICATION PROTOCOL
5.2 Connection and setting up
5.2.1 Signal connection
1. Serial Port COM1 (X2 REMOTE connector)
The serial port COM1 is available for the serial communication via RS232 or RS485. When using a
user application, connect it to this port.
Connect the connector X2 (High density D-Sub15 pin, socket type) to the PC according to Table 19.
Connect only TxD/RxD/GND in the RS232 and D+/D– in the RS485. DO NOT connect other pins
which are reserved as optional use. DO NOT use a commercially available straight cable which all
lines are connected.
X2
(High density D-Sub15 pin, socket)
RS232 2 (TxD)
3 (RxD)
7 (GND)
RS485 12 (D-)
13 (D+)
Used in other applications
1, 4, 5, 6, 8, 9*, 10, 11, 14, 15
* The pin 9 of the connector X2 outputs 5 VDC for option units. DO NOT connect the pin 9.
Doing so may result in damage to peripheral equipment damage, such as PC.
Table 19 - X2 pin position
Figure 47 - X2 connector (High density D-Sub15)
Note: The connector X2 is fitted using #4-40 screws.
The RS232 and RS485 share the X2 COM1 port.
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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