Jetter AG
Programming | 8
User Manual – JetControl 365MC
106 / 148
If RemoteScan has already established a connection for cyclical data transmis-
sion, this connection will be used. Setting-up and clearing-down the connection
is, therefore, not required.
Cyclical data
transmission
Cyclical data transmission is made through the configurable function
RemoteScanConfig()
. The data are cyclically transmitted from and to the Mod-
bus/TCP servers by means of STX variables.
To each Modbus/TCP server (IP address and port) a connection is established.
The connection is established independent of how many communication units are
configured on this server.
If several communication units are configured on one Modbus/TCP server, the
accesses are serialized. This is because the servers often do not support
com-
mand pipelining
. If several servers have been configured, communication is car-
ried out in parallel.
Unit ID
Converters from Modbus/TCP to Modbus RTU use the
Unit ID
for addressing the
Modbus RTU servers. For this reason, the
Unit ID
can be set.
JetSym STX
functions
This is a comparison between the system functions and the corresponding Jet-
Sym STX functions.
System function
Corresponding JetSym STX function
60
Function ModbusCRCgen(FramePtr: Int, Length:
int): Int;
61
Function ModbusCRCcheck(FramePtr: Int, Length:
int): Int;
65/67
Function ModbusReadReg(Const Ref MbParam:
MODBUS_PARAM): Int;
66/68
Function ModbusWriteReg(Const Ref MbParam:
MODBUS_PARAM): Int;
80/85
Function RemoteScanConfig(Protocol:
RSCAN_PROTOCOL, Elements: Int, Const Ref
Configuration: RSCAN_DSCR): Int;
81
Function RemoteScanStart(Protocol: int): Int;
82
Function RemoteScanStop(Protocol: int): Int;
Tab. 59:
System functions vs. JetSym STX functions
INFO
Further information
For more information on this subject, refer to the JetSym Online Help.
