Sim Interface; Sim Interface Connector; Direct Interfacing - Stanford Research Systems SIM918 Operating And Service Manual

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1.6 SIM Interface

1.6.1 SIM interface connector

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

1.6.2 Direct interfacing

The primary connection to the SIM918 Precision Current Preampli-
fier is the rear-panel DB–15 SIM interface connector. Typically, the
SIM918 is mated to a SIM900 Mainframe via this connection, either
through one of the internal mainframe slots or the remote cable in-
terface.
It is also possible to operate the SIM918 directly, without using the
SIM900 Mainframe. This section provides details on the interface.
The DB–15 SIM interface connector carries all the power and commu-
nication lines to the instrument. The connector signals are specified
in Table 1.2.
Direction
Src Dest Description
MF SIM Signal ground
SIM MF Status service request (GND asserted, 5 V idle)
MF SIM HW handshake (unused in SIM918)
SIM MF HW handshake (unused in SIM918)
MF SIM 10 MHz reference (no connection in SIM918)
MF SIM Power supply (no connection in SIM918)
MF SIM Power supply
MF SIM Power ground
Chassis ground
MF SIM Async data (start bit "0"
SIM MF Async data (start bit "0"
MF SIM 10 MHz reference (no connection in SIM918)
MF SIM Power supply
MF SIM Power supply
MF SIM Power supply (no connection in SIM918)
Table 1.2: SIM interface connector pin assignments, DB–15.
The SIM918 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.
The mating connector needed is a standard DB–15 receptacle, such
as Tyco part number 747909–2 (or equivalent). Clean, well-regulated
supply voltages of 15 0 V DC, 5 0 V DC must be provided, follow-
ing the pinout specified in Table 1.2 and the minimum currents in
the table on Page ix. Ground must be provided on Pins 1 and 8, with
chassis ground on Pin 9. The STATUS signal may be monitored
5 V; "1" GND)
5 V; "1" GND)
SIM918 Precision Current Preamplifier
Getting Started