Siemens SIMATIC PG 720 P Manual page 50

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 (20 mA
Deactivating the
current loop). When you connect two programming devices using the COM1
PG 720
(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 4-12.
TTY receive
TTY send, open
Figure 4-12
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 4-12).
6. Close the battery compartment cover.
4-16
deactivated
1 2 3 4 5
Activating/Deactivating the TTY Port Using Jumpers
activated
1 2 3 4 5
TTY send
TTY receive
PG 720 P Programming Device
C79000-G7076-C721-02