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PTS DP1 User Manual
3.3 OR / NORM Switch
This selection supports a special feature of the PTS 103 protocol testing software. This program can monitor
both (primary
→
secondary and secondary
→
primary) data streams of a half duplex connection with only
one serial interface on the PC. To receive both data streams on a single interface, the data must be ORed.
PC with PTS 103 in
ORed monitoring mode
with one serial interface
Primary
Station
(master,
control
center)
Secondary
Station
(slave, relay)
PTS DP1
OR
OR
ORed Data from
both directions
PTS DP1 in ORed monitoring mode
To set the PTS 103 software into the corresponding operation mode, the option "Monitoring of halfduplex
communication …" on the bottom of the Interfaceparameter dialog has to be checked.
The direction of the data is determined from the telegram type (single byte acknowledge $E5 is always
secondary
→
primary) and the PRM bit in the control byte of the link header.
OR
Position
The data received from the two optical links are ORed.
Identical data are available on both RS-232 interfaces of the PTS DP1.
On a half duplex link, the data from both directions can be monitored with the PTS 103 software and only a
single serial interface on the PC.
Of course, setting this switch to the OR position applies only for the monitoring mode.
NORM
Position
The data monitored on the two RS-232 interfaces are seperately sensed form the corresponding optical
interfaces as described above for the MON position of the SIM / MON switch.
