Edwards SCU-350 Series

SCU-350 Series Control Unit for Turbomolecular Pump
MT-21E-201-E
Page 61
5
SERIAL COMMUNICATION PROTOCOL
5.2.2 Pin Assignments
Connect SIM (STP control unit) to PC with the Serial Interface Cable connected according to Table 21
or Table 22. The length of the communication cable should be 15 m or less.
SIM (STP control unit) side
connector
(DB25 pin type)
Connection
PC side connector
(DB25 pin type)
Pin2 (TxD) Pin3 (RxD)
Pin3 (RxD) Pin2 (TxD)
Pin7 (GND) Pin7 (GND)
Table 21 - Pin Assignments of Serial Interface Cable (25pin-25pin)
SIM (STP control unit) side
connector
(DB25 pin type)
Connection
PC side connector
(DB9 socket type)
Pin2 (TxD) Pin2 (RxD)
Pin3 (RxD) Pin3 (TxD)
Pin7 (GND) Pin5 (GND)
Table 22 - Pin Assignments of Serial Interface Cable (25pin-9pin)
5.2.3 Serial settings
Set the serial parameter of the PC side connection port according to Table 23
Serial parameter Set value
Baudrate 9600 bps
Data bits 8 bits
Stop bits 1 stop bit
Table 23 - Serial Parameter