Aalborg TIO Totalizer I/O Flow Monitor/Controller - Manual (Page 12)

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Table 4.2 Maximum rated load impedance for SP output signals
SP
OUTPUT
TYPE
J2 JUMPER
CONFIGURATION
MAXIMUM
LOAD
IMPEDANCE
NOTE
J2A J2B J2C
0 - 5 Vdc 2 - 3 5 - 6 8 - 9 ≤1000 Ohm
0 - 10 Vdc 2 - 3 5 - 6 8 - 9 ≤5000 Ohm
Special Order option! (PCB
hardware must be changed).
4 – 20 mA 1 - 2 4 - 5 7 - 8
≤900 Ohm
(24 Vdc PS)
Self-powered (non-isolated)
current loop. For 12 Vdc PS
the load impedance should not
exceed 400 Ohm.
CAUTION: When connecting the load to the output terminals always
check actual jumper J2 configuration. Do not exceed the rated values
shown in the specifications (see Table 4.2). Failure to do so might
cause damage to this device. Be sure to check if the wiring and the
polarity of the power supply and SP signals are correct before
turning the power ON. Wiring error may cause damage or faulty
operation. Do not connect external voltage source to the SP
output terminals.
ƽ
PV output (+) --------------- pin 5 of the 9 pin "D" connector
PV output (-) --------------- pin 8 of the 9 pin "D" connector
WARNING: The 4-20 mA current loop output is self-powered (non-
isolated). Do not connect an external voltage source to the output
signals.
ƽ
4.4 Digital Communication Interface Connections
The digital interface operates via RS-232 (optional RS-485) and provides access
to all applicable internal configuration parameters and data.
Communication Settings for RS-232/RS-485 communication interface:
Baud rate: default 9600 baud (user-selectable. See specification section).
Stop bit: .................... 1
Data bits: .................... 8
Parity: .................... None
Flow Control: .................... None