Edwards STP-iXA3306CV - 5.3.11 Broadcasting Command in the RS485 Multi-Point Connection; Pump Operation Commands

STP-iXA3306 Series Turbomolecular Pump
MT-82E-001-H
Page 98
5
SERIAL COMMUNICATION
PROTOCOL
Always assign less than 254 characters (n< 254) to the parameter so that the message is less than
256 characters.
Next, the preceding SIM->PC character is "Ack", the instructed query command is executed and the
SIM returns the following response (1st block).
PC->SIM
Ack or Nak
F
1
F
2
SIM->PC
@
F
1
F
2
Stx
0
0
1
Sp
CHR
C
1
C
253
Etb
LRC
Then "Ack" is sent by the PC->SIM character in reaction to the response (1st block) from the SIM, the
SIM returns the following response (2nd block).
PC->SIM
Ack or Nak
F
1
F
2
SIM->PC
@
F
1
F
2
Stx
0
0
2
C
254
C
n
Etx
LRC
The PC transmits "Ack" or "Nak"; then transmits the next command if necessary.
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 33
Pump operation command
Value
START
1
STOP
2
Table 33 - Pump operation commands