Siemens SITRANS FUH1010PVDX, Operating Instructions Manual, Page: 55 / 308

2-17
CQO:1010PVXFM-3
Section 2
2.7 HOW TO USE THE RS-232 INTERFACE
This section describes the hardware, software and procedural requirements for programming the
FUH1010PVX using a PC connected to its RS-232 serial I/O port. Although you can construct your own
interface cable, it is probably more convenient to purchase our serial interface cable (1015CPC-N)
made specifically for this purpose. The Siemens serial interface cable provides both 9-pin and 25-pin
connectors to accommodate all IBM-compatible serial port configurations. You will also need a PC com-
munication program such as Terminal (Windows 3.x) or HyperTerminal (Windows 95/98/NT/2000/XP)
to serve as the data entry interface. These programs reproduce the menu screens that would appear on
the system’s graphic screen. In fact, the example screens in this manual are actual HyperTerminal screen
captures. Once the serial interface is established, the site setup procedure for blind and graphic display
systems are identical. You could choose to program a graphic display system using a PC and a commu-
nications program. However, note that
for models with a local display screen, the serial interface
cable is an option.
NOTE: If you use a DOS-based communications program, make sure that your PC is loading the
ANSI.SYS driver via your Config.Sys start-up file. Set the RS-232 parameters to match
those of the flowmeter (see example of HyperTerminal screen on the next page).
NOTE: Many newer Laptop PC’s are not equipped with serial ports, having USB ports only. These
PC’s will require a USB RS-232 adaptor that can be purchased commercially. Not all of
these adaptors are suitable.
Siemens has found the best performance is achieved
with the adaptor from Radio Shack, (Part# 26-183).
2.7.1 RS-232 INTERFACE CABLE - RS-232 Connectors (use 9-pin or 25 -pin)
The figure below is the schematic of the serial interface cable (MLFB P/N: 7ME3960-0CS00) needed to
make the physical connection between the Flow Display Computer and your PC. The wire ends for the
Flow Display Computer termination are stripped for easy insertion into TB2. Note that both connectors
have their CTS pin shorted to the RTS pin (pins 4-5 on 25-pin connector and pins 7-8 on 9-pin connec-
tor).
1
10
20
11
9-Pin Serial
Connector
TB2 of
1010SX Flow
25-Pin Serial
Connector
TX From
Flowmeter
RX To
Flow-
meter
TB2
RS-232 Interface Cable Wiring