Setting Up Communications Hardware and Network Communications
7-23
S7-200 Programmable Controller System Manual
A5E00066097-02
Using a 10-Bit Modem to Connect an S7-200 CPU to a STEP 7-Micro/WIN 32
Master
Using STEP 7-Micro/WIN 32 on a PC with a Windows 95, Windows 98, or
Windows NT operating system, or using a SIMATIC programming device (such as
a PG 740) as a single-master device, you can connect to only one S7-200 CPU.
You can use a Hayes-compatible 10-bit modem to communicate to a single remote
S7-200 CPU. Figure 7-17 shows S7-200 data communications using a 10-bit
modem with a 5-switch PC/PPI cable.
You will need the following equipment:
• A single S7-200 CPU as a slave device. The CPU 221, CPU 222, CPU 224,
and CPU 226 support the 10-bit format. Previous S7-200 CPUs do not support
the 10-bit format.
• An RS-232 cable to connect the PC or SIMATIC programming device to a
full-duplex,10-bit local modem
• A 5-switch PC/PPI cable (set to the proper baud rate, 10-bit data
communications mode, and DTE mode) to connect the remote modem to the
CPU
• An optional 9-pin to 25-pin adapter (if your modem connector requires it)
Note
The 4-switch PC/PPI cable does not support the 10-bit format.
10-bit
modem
RS-232
RS-232
COMx
RS-232
10-bit
modem
Telephone line
PG/
PC
CPU 224
5-Switch
PC/PPI cable
Local Remote
Full-duplex
Full-duplex
Note: x = your port number
25-pin to 9-pin
Adapter
RS-485
Master
Slave
Figure 7-17 S7-200 Data Communications Using a 10-Bit Modem with a 5-Switch PC/PPI Cable
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