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Which type of cable we need to use to configure from laptop to Micom relays?

Published date: 31 January 2019

Most of our relays are havingRS232 9-pin front port
The relay is a Data Communication Equipment (DCE) device. Thus the pin connections of the relay’s 9-pin front port are as follows: 
Pin no. 2 Tx Transmit data
 
Pin no. 3 Rx Receive data
 
Pin no. 5 0V Zero volts common
 
None of the other pins are connected in the relay. The relay should be connected to the serial port of a PC, usually called COM1 or COM2. PCs are normally Data
Terminal Equipment (DTE) devices which have a serial port pin connection as below (if in doubt check your PC manual):
 
Pin no. 2 Rx Receive data
 
Pin no. 3 Tx Transmit data
 
Pin no. 5 0V Zero volts common
 
For successful data communication, the Tx pin on the relay must be connected to the  Rx pin on the PC, and the Rx pin on the relay must be connected to the Tx pin on the
PC, as shown in figure 5. Therefore, providing that the PC is a DTE with pin connections as given above, a ‘straight through’ serial connector is required, i.e. one
that connects pin 2 to pin 2, pin 3 to pin 3, and pin 5 to pin 5. Note that a common cause of difficulty with serial data communication is connecting Tx to Tx and Rx to Rx.
This could happen if a ‘cross-over’ serial connector is used, i.e. one that connects pin 2 to pin 3, and pin 3 to pin 2, or if the PC has the same pin configuration as the
relay.
 

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