5.3.11 Broadcasting Command In The Rs485 Multi-Point Connection; Pump Operation Commands - Edwards STP-iS2207 Series Instruction Manual

Always assign less than 254 characters (n< 254) to the parameter so that the message is less than
256 characters.
5
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
SIM->PC @ F
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
SIM->PC @ F
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") to network frame number. Note that there is
no response from the respective SIM.
PC->SIM @ 0
SIM->PC
Parameter
1
MT-89E-001-C
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STP-iS2207 Series Turbomolecular Pump
F Stx 0 0 1 Sp CHR C
1 2
F Stx 0 0 2 C
1 2 254
0 Stx 0 0 1 Sp E
Item
Pump operation command
Pump operation command
START
STOP
Table 21 - Pump operation commands
C Etb LRC
1 253
Ack or Nak
C Etx LRC
n
Parameter 1 Etx LRC
Data Format
8-bits hexadecimal Refer to Table 21
coded ASCII
Value
1
2
Ack or Nak F F
1 2
F F
1 2
No response
Remark