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4-7
PG 760 Programming Device
C79000-G7076-C761-01
When the PG 760 leaves the factory, the COM1 (TTY) serial port is switched
to active (20 mA current loop). If you are connecting two programming
devices via the COM1 (TTY) serial port, you must switch one of the ports to
passive. The PG 760 has a switch on its motherboard for this purpose. You
must remove the bus card in order to reach this switch.
Change the switch position as shown in the diagram below:
No other settings must be changed.
TTY receive
TTY transmit
passive
active
1
2
1 2
OFF
ON
1 2
OFF
ON
Figure 4-4
Switching the TTY Port to Active/Passive
Switching the
PG 760 to
Active/Passive
Switch Position
PG 760 Expansions