HARDWARE
TB1 – POWER - A.C. power connections
1 G Ground Earth ground line
2 N Neutral Non-fused neutral line
3 H Hot Fused line
TB2 – RELAYS – Set point relay contacts
The relays, which are mechanical, can switch 3A, 250V A/C or D/C loads. The contacts are
“dry;” they do not have any potential.
1 L
2 +
CH1 contact Channel 1 low-level or high-level relay contact.
3 R
4 +
CH2 contact Channel 2 low-level or high-level relay contact.
TB3 – ANALOG OUT – 4-20mA analog outputs
1 +L CH1 positive signal
2 -L CH1 negative signal
Channel 1, active 4-20mA analog output.
3 +R CH2 positive signal
4 -R CH2 negative signal
Channel 2, active 4-20mA analog output.
TB4 – CH1 (EI2000-LEFT) Scale input 1
TB5 – CH2 (EI2000-RIGHT) Scale input 2 (Note: Connections 6 & 7 are not present on TB5)
1 +E Positive excitation
Positive power supply for the scale base, which is 5V +/-
5%.
2 +S Positive signal Positive scale signal input
3 -S Negative signal Negative scale signal input
4 -E Negative excitation
Negative power supply voltage (return) for the scale base,
which is 0 volts referenced to signal ground.
5 SH Shield Connected to earth ground
6 + Positive sense
TB4 only: Connected to the negative sense (or negative
excitation if the negative sense terminal is not present) at
the scale summing board to allow the voltage drop of the
cable to be compensated for.
7 - Negative sense
TB4 only: Connected to the positive sense (or positive
excitation if the positive sense terminal is not present) at the
scale summing board to allow the voltage drop of the cable
to be compensated for.
TB6 – Serial I/O and SWITCH INPUT
1 A RS485 – A line
2 B RS485 – B line
Half-duplex RS485 interface.
3 C Common
This is signal ground for the RS232, RS485 and switch
input, IN.
4 R RS232 – Rx line RS232 receive
5 T RS232 – Tx line RS232 transmit
6 IN Switch input
The external, potential free (dry) switch connects to IN and
C terminals.
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