Using a PC to access a PLC via GSM modem

To use a PC running U90 Ladder to access a remote PLC for programming and maintenance via GSM networks:

1. Connect your PLC to the GSM modem according to the instructions supplied with the GSM Modem Kit.

2. Connect your PC to the GSM modem.
   If you have carried out the Prepare Modem procedure, you can skip steps 3 and 4.

   

   1	RS232 connector
   2	RS232 cable MJ10-22-CS28 (available by separate order)
   3	RS232 connector
   4	GSM Modem serial port
   5	GSM antenna
   6	Power supply PS-GSM modem (available by separate order)
   7	RJ11 connector
   8	GSM modem power supply
   9	SIM card drawer

    

3. Configure U90 Ladder’s modem initialization commands.

   1. Open the PLC box by selecting PLC from the Controller menu.

   2. Set the PLC’s Time-Out to 2 seconds as shown below. This should allow sufficient time for PC-to-PLC communications via the GSM modem.

   

4. Dial the remote PLC modem from your PC.

   

Related topics

Configuring my PC's modem

Modem Troubleshooting

Using Hyperterminal for Modem Troubleshooting

PC modem communication problems

Modem Communications-- System Bits and Integers