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Installing and Operating the PG 720
Note
If you connect two programming devices using the TTY interface, you
must deactivate the TTY interface (COM1) on one of the devices by
changing the jumper settings. When supplied, this interface is always
active.
Activating/
When your PG 720 is supplied, the COM1 (TTY) serial port is active
Deactivating the
(20 mA current loop). When you connect two programming devices
PG 720
using the COM1 (TTY) serial port, you must deactivate the port on one
of these devices. The PG 720 has jumpers on the mother board for this
purpose.
These jumpers are accessible if you open the battery compartment
cover.
Jumper Settings
Change the jumper settings as shown in Figure 4-13.
TTY receive
TTY send, open
Figure 4-13 Activating, Deactivating the TTY Port using jumpers
Changing the
Proceed as follows to deactivate the port on the PG 720:
Jumper Setting
1. Switch off your device.
2. Adjust the position of the PG 720 so that it is horizontal.
3. Open the battery compartment cover.
4. Remove jumpers 2-3 and 4-5 at the top left beside the battery.
5. Insert the jumper in slot 1-2 (see Figure 4-13).
6. Close the battery compartment cover.
4-20
deactivated
1 2 3 4 5
1 2 3 4 5
activated
TTY send
TTY receive
PG 720 PII Programming Device
C79000-G7076-C756-02
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