VIPA CPU 312SC - Page 144

Parameter Declaration Data type Description
PROTOCOL IN BYTE 1=ASCII, 2=STX/ETX, 3=3964R
PARAMETER IN ANY Pointer to protocol-parameters
BAUDRATE IN BYTE Number of baudrate
CHARLEN IN BYTE 0=5bit, 1=6bit, 2=7bit, 3=8bit
PARITY IN BYTE 0=Non, 1=Odd, 2=Even
STOPBITS IN BYTE 1=1bit, 2=1.5bit, 3=2bit
FLOWCONTROL IN BYTE 1 (fix)
RETVAL OUT WORD Return value (0 = OK)
All time settings for timeouts must be set as hexadecimal value. Find
the Hex value by multiply the wanted time in seconds with the bau-
drate.
Example:
Wanted time 8ms at a baudrate of 19200baud
Calculation: 19200bit/s x 0.008s
≈ 154bit → (9Ah)
Hex value is 9Ah.
Here you fix the protocol to be used.
You may choose between:
1: ASCII
2: STX/ETX
3: 3964R
4: USS Master
5: Modbus RTU Master
6: Modbus ASCII Master
At ASCII protocol, this parameter is ignored.
At STX/ETX, 3964R, USS and Modbus you fix here a DB that con-
tains the communication parameters and has the following structure
for the according protocols:
Data block at STX/ETX
DBB0: STX1 BYTE (1. Start-ID in hexadecimal)
DBB1: STX2 BYTE (2. Start-ID in hexadecimal)
DBB2: ETX1 BYTE (1. End-ID in hexadecimal)
DBB3: ETX2 BYTE (2. End-ID in hexadecimal)
DBW4: TIMEOUT WORD (max. delay time between 2
telegrams)
Parameters
PROTOCOL
PARAMETER (as DB)
VIPA System 300SDeployment PtP communication
Parametrization> FC/SFC 216 - SER_CFG
HB140 | CPU-SC | 312-5BE13 | GB | 15-50 144