Siemens S7-200PLC User Manual page 13

the PC, then choose this serial port in the local connection of STEP7 Micro/WIN software ,as the
same as you use the traditional PC/PPI programming cable.
Notice:The COM port of local connection in the "set PG/PC interface" menu of Siemens
programming software STEP7 Micro / WIN can most support COM8, even though it can display
above COM8, in fact it can't use.
About the detailed instructions of the VCOMM virtual serial port software, please read " VCOMM
virtual Serial Port software Manual.
Siemens S7-200PLC 11-bit RS485 interface communication parameters: data bits = 8 bits, parity =
EVEN (even parity), stop bit = 1, referred to as: 8E1. This is the PLC default mode.
Siemens S7-200PLC 10-bit RS485 interface communication parameters: data bits = 8 bits, parity =
NONE (no parity), stop bit = 1, referred to as: 8N1.This mode is used in the Internet
communication.
S7-200PLC baud rate = 9.6Kbps or 19.2Kbps , ES-ETH-PPI does not support 187.5Kbps baud
rate. Firstly please use such as PC / PPI programming cable to check the PLC baud rate,and the
ES-ETH-PPI serial port parameters must be set as the same parameters with the PLC, so we set
S7-200PLC baud rate as 9.6Kbps in the following examples.
Firstly set ES-ETH-PPI serial port parameters in parameters setting software , where the serial port
protocol box "RS232" option is supporting RS232/RS485/RS422 communication and must ensure
that this serial port parameters and the S7-200PLC RS485 interface parameters are the same,
Otherwise, It can't normally communicate.
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