STP-iS2207 Series Turbomolecular Pump
MT-89E-001-C
Page 68
5
SERIAL COMMUNICATION PROTOCOL
5.2 Connection and setting up
5.2.1 Signal connection
1. Serial Port COM1 (X3 COM1 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 X3 (D-Sub9 pin, socket type) to the PC according to Table 16. 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.
However, when using the Profibus (optional accessory), serial communication function is not available
because of the different connector pin position. (see the Instruction Manual of the Profibus)
X3
(D-Sub9 pin, socket)
RS232 2 (TxD)
3 (RxD)
5 (GND)
RS485 7 (D-)
8 (D+)
Reserved
1, 4, 6*, 9
* The pin 6 of the connector X3 outputs 5 VDC for option units. DO NOT
connect the pin 6. Doing so may result in damage to peripheral
equipment damage, such as PC.
Table 16 - X3 pin position
5 4
3 2 1
9 8 7 6
Figure 35 - X3 connector (D-Sub9)
Note: The connector X3 is fitted using M2.6 screws.
The RS232 and RS485 share the X3 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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