Direct Interfacing - Stanford Research Systems SIM914 Operation And Service Manual

350 mhz preamplifier

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1.3.2 Direct Interfacing

CAUTION

The primary connection to the SIM914 ˜ Ampliﬁer is the rear-panel

DB–15 SIM interface connector. Typically, the SIM914 is mated to

a SIM900 Mainframe via this connection, either through one of the

internal Mainframe slots, or the remote cable interface.

It is also possible to operate the SIM914 directly, without using the

SIM900 Mainframe. This section provides details on the interface.

The SIM914 has no internal protection against reverse polarity, missing

supply, or overvoltage on the power supply pins. Misapplication of power

may cause circuit damage. SRS recommends using the SIM914 together

with the SIM900 Mainframe for most applications.

The mating connector needed is a standard DB-15 receptacle, such

as Amp part # 747909-2 (or equivalent). Clean, well-regulated sup-

ply voltages of

5 VDC must be provided, with +5 V supplied on

Pin 13 and

5 V supplied on Pin 6 (see Table 1.1). Ground may be

provided on any combination of Pins 1, 8 or 9. The STATUS signal

may be monitored on Pin 2 for a low-going TTL-compatible output

indicating an ampliﬁer overload condition.

Operation

SIM914 350 MHz Preampliﬁer

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