Interfaces; Connecting A Fit Load Cell To A Computer Via An Rs 232 Interface - HBM FIT/0 Série Guide De Démarrage

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3

Interfaces

R
FIT load cells are delivered as required with an RS 232, RS 485,
CANOpen or DeviceNet interface. The ground reference for all interface
signals is based on the power supply ground of the FIT
3.1 Connecting a FIT load cell to a computer via an
RS 232 interface
Pin assignment
for PC (RS 232)
Device socket 25 pin Device socket 9 pin
(solder side) (solder side)
1
14
2 TxD
6
3
RxD
9
7 GND
Ground/
Housing
25
13
The RS 232 interface is suitable for a point to point connection (one FIT
cell to one interface). Only the signals RxD (Receive Data), TxD (Transmit
Data) and GND1 are required.
For communication with an external device, the TxD line must be connected
to the RxD of the FIT and vice versa.
HBM
DC variable
Ground/
−
Enc.
1
RxD
2
TxD
3
GND
5
Shielding
+
red
blue
green
white
R
load cell (GND1).
FIT
RS 232
+6 – +30V
TxD
RxD
GND
R
A1779-1.2 de/en/fr/es
FIT
load