Siemens SITRANS FUS1020, Manual, Page: 57 / 251

3-2
1020NFM-1D
Section 3
3.2 INPUT/OUTPUT WIRING
The following tables and illustrations describe both the 1020N and 1020DN input/output signals. Con-
sult the Installation Drawings in Appendix A for details regarding I/O and transducer connections for
your specific model.
3.2.1 1020N INPUT/OUTPUT WIRING (TB1 and TB2)
1020N INPUT/OUTPUT WIRING (TB2)
PIN# SIGNAL FUNCTION DESCRIPTION
1 GROUND GROUND GROUND
2 Digln1 Digital Input CH 1 NoTotCh1 Input (see 1020-7 Schematic D).
3 Digln1 Ret Digital Input Return Ch 1 NoTotCh1 Return (see 1020-7 Schematic D).
4 Digln2 Digital Input Ch 2 ClrTot Input (see 1020-7 Schematic D).
5 Digln2 Ret Digital Input Return Ch 2 ClrTot Return (see 1020-7 Schematic D).
6 RS232 Rx RS-232 Receive Std RS-232 Signals & Port Receive Data from outside source
7 RS232 Tx RS-232 Transmit Std RS-232 Signals & Port Transmit Data to outside destination
8 Ground Ground Standard RS-232 Signals and Port
9 RS232 RTS RS-232 Request to Send Standard RS-232 Signals and Port
10 RS232 CTS RS-232 Clear to Send Standard RS-232 Signals and Port
1020N INPUT/OUTPUT WIRING (TB1)
PIN# SIGNAL FUNCTION DESCRIPTION
1 N/C NOT DEFINED Reserved for future implementation.
2 N/C NOT DEFINED
3 Isolo1 Ret ISOLATED LOOP RETURN Spannable 4-20 mA output proportional to any available data
4 lsoIo1 ISOLATED LOOP SUPPLY variable assigned under menu control. See drawing 1020-7
Schematic A (Loop Powered).
5 +5 VDC For CC Supplied Access. Only Up to 250 mA +5 Volts Source
6 Ground Ground Ground
7 DigOut1 Ret STATUS BIT RETURN Status output responds to any available alarm function
8 DigOut1 STATUS OUTPUT assigned under menu control (see 1020N-7 Schematic C).
9 IsoPgen Ret STATUS BIT RETURN Pgen Source. Synthesized digital pulse proportional to flow
10 IsoPgen STATUS OUTPUT (see 1020-7 Schematic C).
MENU LOCKOUT SWITCH S1
I/O Terminals TB1 and TB2
TB1
TB2
J1 (DB9)
PIN# SIGNAL
1 NU
2 Rs232 Rx
3 Rs232 Tx
4 Rs232 DTR
5 Ground
6 NU
7 Rs232 RTS
8 Rs232 CTS
9 NU
J1