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Compatibility Issues
The following table shows the communication channels between HTS and applications under the different operation systems. Please note that DDE is only defined for the 16 bit address space and therefore is only available for 16 bit applications.
Platform
Windows 3.1 / Windows 3.11
Windows NT / Windows 95
Table 2: HTS communication
possible communication
OLE (16 bit)
DDE (16 bit)
OLE (16 bit or 32 bit)
DDE (only for 16 bit programs)
Topology
Two basic net topologies are supported:
•
Point-to-point
A single counter connects directly to the PC. The counter is equipped with an RS232 interface using TP3 protocol.
•
Network of up to 31 counters
The counters are equipped with an RS485 interface using TP3 protocol and are connected to form a 2wire bus. The bus converter RTC transforms the
RS485 bus to the RS232 COM interface of the PC.
HTS and RTC are designed to fit to each other perfectly.
Figure 2: Point-to-point connection Figure 3: Counters on RS 485 bus
4 basic arrangements are possible on one COM interface of the PC:
S) 1x Counter RS232 <—> RS232 COMx
S1)
1x Counter RS232 Modem <—> Modem RS232 COMx
N)
Counter 1
...
Counter 31
RS485
...
RS485
RTC <—> RS232 COMx
N1)
Counter 1
...
Counter 31
RS485
...
RS485
Table 3: Basic arrangements
RTC Modem <—> Modem RS232 COMx
HTS for Windows page 5
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