Sim Interface; Sim Interface Connector; Direct Interfacing - Stanford Research Systems SIM910 Operating Manual

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1.4 SIM Interface

CAUTION

1.4.1 SIM interface connector

Pin Signal
1 SIGNAL GND
2 STATUS
3 RTS
4 CTS
5 REF 10MHZ
6 5 V
7 15 V
8 PS RTN
9 CHASSIS GND
10 TXD
11 RXD
12 REF 10MHz
13 5 V
14 15 V
15 24 V

1.4.2 Direct interfacing

The primary connection to the SIM910 JFET Preamp is the rear-panel
DB–15 SIM interface connector. Typically, the SIM910 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 SIM910 directly, without using the
SIM900 Mainframe. This section provides details on the interface.
The SIM910 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 SIM910 together
with the SIM900 Mainframe for most applications.
The DB–15 SIM interface connector carries all the power and commu-
nications lines to the instrument. The connector signals are specified
in Table 1.1
Direction
Src Dest Description
MF SIM Ground reference for signal
SIM MF Status service request (GND asserted, 5 V idle)
MF SIM HW Handshake ( 5 V talk; GND stop)
SIM MF HW Handshake ( 5 V talk; GND stop)
MF SIM 10 MHz reference (no connection in SIM910)
MF SIM Power supply (no connection in SIM910)
MF SIM Power supply (analog circuitry)
MF SIM Power supply return
Chassis ground
MF SIM Async data (start bit "0"
SIM MF Async data (start bit "0"
MF SIM 10 MHz reference (no connection in SIM910)
MF SIM Power supply (digital circuitry)
MF SIM Power supply (analog circuitry)
MF SIM Power supply (no connection in SIM910)
Table 1.1: SIM Interface Connector Pin Assignments, DB-15
The SIM910 is intended for operation in the SIM900 Mainframe, but
users may wish to directly interface the module to their own systems
without the use of additional hardware.
Operation
5 V; "1" GND)
5 V; "1" GND)
SIM910 JFET Preamp