Rear Panel
Chapter Three: Hardware Overview
36
I/O Connector
The I/O connector provides the following features:
•
Interface to a Type 274 multiplexer
•
Relay closures for trip points
•
±15 Volt output signals
•
Remote access of the range select, remote zero function, and trip point latch functions
•
Pressure output signal
Note
The Key Lock switch must be in the
REMOTE
position for the remote
range selection, remote zero, and remote trip point latch functions to
function.
The I/O connector contains one 37-pin female Type “D” connector. The pinout is listed in
Table 9, page 37.
Interfacing the Type 670 Instrument to a Type 274 Multiplexer
Use the 670 instrument to configure the channels on the 274 multiplexer. Refer to How To
Interface to the Type 274 Multiplexer, page 69, for instructions.
Note
The 670 instrument cannot control the heater power on the 274
multiplexer.
Use either a CB670-1 or CB670-2 cable to connect the I/O connector to the 274 multiplexer.
Refer to How To Interface to the Type 274 Multiplexer, page 69, for a description of the cables.
Pressure Output Signal
The analog pressure output signal, available on pin 36 of the I/O connector and pin 1 on the
Signal connector on the Signal Conditioner board, is a 0 to 10 VDC signal (on each range).
Refer to Table 9, page 37, for the complete pinout of the I/O connector. A 10 Volt signal
corresponds to a full scale pressure signal; a 1 Volt signal corresponds to a 10% of full scale
pressure signal. The pressure output signal is independent of the pressure units.
Use pin 1 on the Signal connector to access the pressure output signal if your 670 instrument is
connected to a 274 multiplexer. The CB670-1 or CB670-2 cable occupies the I/O connector
when the 670 instrument is connected to the 274 unit.
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