4-16
PG 720 P Programming Device
C79000-G7076-C721-02
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.
When your PG 720 is supplied, the COM1 (TTY) serial port is active (20 mA
current loop). When you connect two programming devices 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.
Change the jumper settings as shown in Figure 4-12.
TTY receive
TTY send
deactivated
activated
1 2 3 4 5
1 2 3 4 5
TTY receive
TTY send, open
Figure 4-12
Activating/Deactivating the TTY Port Using Jumpers
Proceed as follows to deactivate the port on the PG 720:
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 4-12).
6. Close the battery compartment cover.
Activating/
Deactivating the
PG 720
Jumper Settings
Changing the
Jumper Setting
Installing and Operating the PG 720
