Figure 3-3 Rs-232 Interface Cable Wiring - Siemens SITRANS F Serie Guide Rapide

Commissioning
3.2 Flowmeter connection using RS-232
communications program. Most PC computers provide at least one serial port using either a
9-pin or 25-pin D-type connector. The port designation can be either COM 1 or COM 2.
Usually, when a computer includes two serial ports, COM 1 will be the 9-pin connector and
COM 2 will be the 25-pin connector; however, port designations can vary. (See Quick
Terminal Mode Setup procedure.)
1. Referring to the schematic below, wire the RS-232 Interface cable.
Note
Many newer Laptop PCs are not equipped with serial ports, having USB ports only.
These PCs will require a USB RS-232 adapter that can be purchased commercially. Not
all of these adapters are suitable.
with the adapter from Radio Shack (part#26-183).
2. Connect the cable between the flowmeter and the PC using either the 9-pin, 25-pin or
3. Refer to the flowmeter manual for details for accessing the Installation Menu.
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 flowmeter and your PC. The wire ends
for the flowmeter terminations 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 connector).
① TB1
② 9-PIN SOLDER SIDE
③ 25-PIN SOLDER SIDE
④ 25-Pin Serial Connector
⑤ 9-Pin Serial Connector
⑥ CABLE PIN 1015CPC-N
Figure 3-3 RS-232 Interface Cable Wiring
18
USB-to-RS-232 cable connector, depending upon the port's architecture.
Siemens has found the best performance is achieved
⑦ Red Wire
⑧ White Wire
⑨ Black Wire
⑩ TB2 of Flowmeter
⑪ RX To Flowmeter
⑫ TX From Flowmeter
Operating Instructions, 1/2009, CQO:QSG009 Rev A
SITRANS FUH1010 Quick Start Guide