Edwards STP-iXA4507 Series - 5.3.11 Broadcasting Command in RS485 Multi-Point Connection; Pump Operation Commands

STP-iXA4507 series Turbomolecular Pump
MT-91E-001-0
Page 77
SERIAL COMMUNICATION PROTOCOL
5
The parameter characters are less than 254 characters (n< 254) when the message is less than 256
characters.
Then if 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
And then, if "Ack" is sent by the PC->SIM character as a response (1st block) to 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 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 21
Pump operation command
Value
START
1
STOP
2
Table 21 - Pump operation commands