Edwards STP-iX455 - Broadcasting Command in the RS485 Multi-Point Connection

STP-iX455/iXL455 Series Instruction Manual
9-16
Operation
Transmission frame when data is transmitted from one block and returned to two block
Designate a query command on the PC.
←Less than 256 chr.→
PC→SIM
@ F
1
F
2
Stx 0 0 1 ? CHR C
1
C
n
Etx LRC
SIM→PC
Ack or Nak F
1
F
2
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 SIM->PC 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.
9.3.11 Broadcasting Command in the RS485 Multi-point Connection
START or STOP of pump operation command allows to be concurrently instructed to all
the multi-connected SIMs. Always assign 0 (HEX code "30", "30") to network frame No.
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 commands
8-bits hexadecimal
coded ASCII
See Table 9.6
Table 9.6 Pump Operation Commands
Pump operation command Value
START 1
STOP 2