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Using COM1 and COM2 (RS422)


I need more serial interfaces. How do I access COM1 or COM2 ?


Check first if they are not already there. Go to services/Interfaces.

You see that dflex 1 is on address 200 and has interrupt 5. Address and interrupt are checked automatically by the program. Of course cards must be switched and jumpered so that no collision occurs.

Next step is to from Windows. Go to Service/Control Panel/Devices. Go down to serial and press the [STOP] button.

Then press the [STARTUP] button and select manual (Automatic is default).

Then go to arguments.txt in D:\EditorGT\user\system and input –com2 if you want COM2 (in the rack version COM1 is the touch screen).

When you start next time the application. You will see COM2 in Services/Interfaces:


COM2 can be converted into RS422 by jumpering the CPU card. For example below you see a connection to a Muller Rapido stacker (note the Baudrate. Muller stackers have weird settings)

COM2(DB9 fem. connector)         Rapido (DB9 male)

RxD+(pin 3)                                      WHT (pin 2)
TxD+ (pin 2)                                     BRN (pin 3)
RxD- (pin 4)                                     GRN (pin 7)
TxD- (pin 1)                                     YEL (pin 8)

Motherboard CPU jumpers (COM2):

JP7 3-4 (RS422 printed on motherboard)
JP8 2-3, 5-6, 8-9, 11-12 (RS422 printed on motherboard)

In Rapido:

• Baudrate at 9600, 7 bits, odd parity, 2 stopbits, no handshake