Flintec DAS 72.1 - Manual (Page 24)

C.1 COMMUNICATIONS & GETTING STARTED
C.1.1 Serial interface
Communicating with the DAS 72.1 digitizer is carried out via the RS422/RS485 port.
The data format is the familiar 8/N/1 structure (8 data bits, no parity, 1 stop bit).
Available baud rates via the RS422/RS485 port are as follows:
9.600, 19.200, 38.400, 57.600 or 115.200 baud.
RS422
• Connection using a 4 wire technique.
• Point-to-Point connection, i.e. no bus communication possible.
• Half duplex setup (DX=0).
RS485
• Connection using 2- or 4-wire techniques.
• Multi-drop connection possible, up to 32 DAS 72.1.
• Half or Full Duplex (DX=0 or DX=1) possible.
(RS232)
• Select a RS485/RS232 converter.
C.1.2 Command Language
The command set of the DAS 72.1 series is based on a simple ASCII format (2 capital letters). This enables
the user to setup the device, get results or check parameters.
Example:
DAS 72.1 with the address or channel number 1 is connected via the RS 485 port to a bus system. You want
to get the net weight.
In this manual “_“ means space & “
¿“ means enter (CR/LF)
Master (PC / PLC) sends Slave (DAS 72.1) responds Status
OP_1
¿ open device #1
OK device #1 ready
GN
¿ get Net weigh
N+123.45
Net weight with algebraic
sign / comma
The command OP_2 opens the communication channel to DAS 72.1 device #2. Now device #2
acknowledges that it is active and responds to any commands on the bus. Communication with device #2
will be closed by another OP command (for another device on the bus e.g. OP_5) or by the command CL_2.
Each OP_X command implies a CL command to all other devices on the bus except device #X. This makes
the address structures easier and the system performance improves.
Page 24 Manual DAS 72.1