Edwards SCU-800

SCU-800 Control Unit for Turbomolecular Pump
MT-49E-101-G
Page 76
5
SERIAL COMMUNICATION
PROTOCOL
5.3.11 Broadcasting command in the RS485 multi-point connection
The START or STOP of STP pump operation command can be concurrently instructed to all the
multi-connected SIMs. Always assign 0 (HEX code "30", "30") to network frame number. Note that
there is no response from the respective SIM.
PC->SIM
@
0
0
Stx
0
0
1
Sp
E
Parameter 1
Etx
LRC
SIM->PC
No response
Parameter
Item
Data Format
Remark
1
Pump operation command
8-bits hexadecimal
coded ASCII
Refer to Table 19
Pump operation command
Value
START
1
STOP
2
Table 19 - Pump operation commands