STP-iXR1606 Turbomolecular Pump
MT-79E-001-D
Page 70
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 20. 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.
2. Serial Port COM2 (X4 COM2 connector)
The serial port COM2 is available for the serial communication via RS485. When using a user
application, connect it to this port.
Connect the connector X4 (D-Sub9 pin, socket type) to the PC according to Table 20. DO NOT
connect other pins which are reserved as optional use.
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)
X4
(D-Sub9 pin, socket)
RS232 2 (TxD) -
3 (RxD) -
5 (GND) -
RS485 7 (D-) 7 (D-)
8 (D+) 8 (D+)
Reserved 1, 4, 6*, 9 1, 2, 3, 4, 5, 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
equipments damage, such as PC.
Table 20 - X3/X4 pin position
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