User’s Guide for USB/PPI+ Programming Cable
Summary:
USB/PPI+ is the programming cable in which USB interface provided
the serial connection, RS485 signal conversion and PPI protocol
conversion. Under the control of computer-driven driver, the
programming cable makes it possible for the computer's USB
interface to simulate the traditional serial (known as COM
interface), thus various existing programming software such as
communications software, monitoring software and other applications
can be normally used.
The working power supply of this cable is directly from the USB
port and the programming port of the PLC. The two-color LED on the
converter box indicates data’s transceiving status.
Outline configuration:
signals definition of the RS485-Block (DB9M) of the USB/PPI+
pins | signal | Description | |
3 | RxD/TxD+ | Data Line B (RS485 signal positive) |
8 | RxD/TxD- | Data Line A (RS485 signal negative) |
7 | P24V | 24V power positive | |
2 | M24V | 24V power negative(RS485 logic ground) | |
Features and technological index:
Support USB/PPI+ operating system: Windows2000/XP
(WinNT4/95/98/Me/DOS not included )
Support USB/PPI+ programming software version: STEP7 Micro / WIN
V3.2 and above.
Fully compatible with USB V1.1 norms and USB CDC V1.1
USB bus powered and PLC programming port 24 V power supply
Optical isolation voltage: 1000 VDC ((up to 3000 VDC, it should be
declared when making an order)
Baud rate: 300 bps ~ 1Mbps automatically adapt to the standard baud
rate
Support UART data format: data bits: 7-8; stop bit: 1, 2;
check-bit: odd / even / no parity
Support long-distance communications, the largest communications is
two kilometers (9600 bps)
Each PC only supports one USB cable programming
Working temperature: -20 ~ +75
Cable length: 3m; Color: black
Usage:
USB device drivers should be installed before using USB/MPI+
programming cable, which are available on the CD-ROM sold together
with the cable. And for the specific installation steps, please
refer to the instruction files on the CD-ROM drivers, and details
are not necessarily listed here.
After completing Driver installation, the corresponding COM port
for the USB/PPI programming cable will be displayed in the Device
Manager” of Window. The step next is just to choose this COM port
in the programming software and other application software and keep
other communication parameters as in the Default settings. And the
following steps are exactly the same as in the traditional
programming cables with RS232 interfaces. Here are requested to
indicate that "USB" option in the local communications interface
setting which the software is not support to the programming cable.
If the COM port in the programming software with "*" symbols, such
as "* COM3", it’s shown that the COM port have faults. Quit the
software and plug a USB plug or re-install the USB driver.
This cable do not support the 187.5 Kbps baud rate as the same with
the Siemens PC / PPI programming cable which with the RS232
interfaces.
Please note that Siemens COM port in programming software is up to
support the option to COM8.But the ports more than COM8 are able to
choose but in fact can not be used!
Note: To communicate with the latest introduced Siemens S7-200CN
CPU; the following conditions must be met:
1, Programming software version: STEP7 Micro / WIN V3.2 and above.
2, Set up the programming software as Chinese state.
Long-distance communications:
The largest communications range between the USB/PPI+ and PLC are
up to 2 kilometers (9600 bps),when external plus terminals 120 ohm
resistance is needed to connect between the pin3 and pin8 of the
RS485 ports (DB9 Male) to eliminate signal reflection, but also a
24 VDC power between the pin2 and pin7.
And a PFB-G Bus Isolators is needed to install at the end of PLC.
0.22 mm2 or more unshielded twisted pair lines are used for
Communications. When the distance is Over 2,000m, a RS485 repeaters
(model: E485GP, products of FOURSTAR as well), can be installed in
the bus for extending the distance.
Please Note: USB interface cable cannot be extended.
