5
Functional description
Page 92
gas-lab
Q1
The necessary programming of the host can be minimised by selecting the
Master
operating mode for the
gas-net
Q1. In this case it is not necessary to
compile a job list for the host. The entire data block assignment is carried out via
the
gas-net
device parameterisation. However, at least the agreed data blocks
and the basic protocol functionality must have been created in the host of
course.
The communication between the host computer and the
gas-net
Q1 is subject to
several basic requirements. The following list provides a summary:
Communication protocol:
RK512/3964R
– point-to-point
Interface:
V24 (RS232) with PC/AT pin assignment at the
gas-net
device (COM2-interface).
RS232 or RS422 via serial interface of an MSER2-board in
the
gas-net
device.
Transmission rate:
adjustable to 2400, 9600, 19200 or 38400 baud
Transmission parameters:
8 data bits, even parity, 1 stop bit
3964R telegrams:
Max. 128 bytes (64 DW) per telegram
RK512 response
telegrams:
A maximum of 64 data words per telegram, no 3964R
response telegrams. In the RK512 slave operating mode
(i.e. host = master), the
gas-net
device generates the
response telegrams listed in the table below: