Stanford Research Systems RGA100, Operating Manual And Programming Reference

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Rear Panel 4-5
SRS Residual Gas Analyzer
1 +24VDC
Pin # Voltage
2 +24VDC
3 Ground
4 Ground
5 Ground
6 +24 VDC
7 Ground
8 +24 VDC
9 Ground
1 2 3 4 5
6 7 8 9
Figure 4 ECU 24 VDC Power Connector
RS232/DCE/28.8k Connector
Use this connector to interface the RGA to a computer. The RS232 interface connector
of the RGA is configured as a DCE (transmit on pin 3, receive on pin 2) with full
RTS/CTS handshaking enabled. Use a straight through RS232 cable with 9-pin, type D
connectors to connect the computer (usually DTE) to the ECU. The communication
parameters are fixed at: 28,800 baud rate, 8 data bits, no parity, 2 stop bits.
LED’’s
Eight LED’’s provide constant feedback on the operation of the RGA. The function of the
LED’’s is described later in this chapter.
Locking Knobs
Use the two knobs to lock the ECU box in place at the end of the ECU installation
procedure. Do not overtighten the knobs. (Hand tighten only.)
Power entry module (Option 02)
Use this connector to power the RGA directly from an AC outlet. Use the three-wire
power cord provided by SRS to connect the RGA directly to a properly grounded AC
outlet. Use the built in switch to turn the unit on-off.
Refer to the first page of this manual for instructions on selecting the correct line voltage
and fuse. The built-in power module (Option 02), has universal input (90-264 VAC, 47-
63 Hz), and completely eliminates the need for an external 24VDC power supply
connection.