Sim Interface - Stanford Research Systems SIM984 Operation And Service Manual

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1.3 SIM Interface

CAUTION
1.3.1 SIM interface connector
Pin Signal
1 SIGNAL GND
−STATUS
2
3 RTS
4 CTS
−REF 10MHZ
5
−5 V
6
−15 V
7
8 PS RTN
9 CHASSIS GND
10 TXD
11 RXD
+REF 10MHz
12
+5 V
13
+15 V
14
+24 V
15
output offset through the front-panel access hole in the "OUTPUT"
block.
The primary connection to the SIM984 Isolation Amplifier is the rear-
panel DB–15 SIM interface connector. Typically, the SIM984 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 SIM984 directly, without using the
SIM900 Mainframe. This section provides details on the interface.
The SIM984 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 SIM984 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 (not used in SIM984)
SIM ⇒ MF
HW handshake (not used in SIM984)
MF ⇒ SIM
10 MHz reference (no connection in SIM984)
MF ⇒ SIM
Power supply (no connection in SIM984)
MF ⇒ SIM
Power supply
MF ⇒ SIM
Power supply return
Chassis ground
MF ⇒ SIM Async data (start bit = "0"= +5 V; "1" = GND)
SIM ⇒ MF Async data (start bit = "0"= +5 V; "1" = GND)
MF ⇒ SIM
10 MHz reference (no connection in SIM984)
MF ⇒ SIM
Power supply
MF ⇒ SIM
Power supply
MF ⇒ SIM
Power supply
Table 1.1: SIM Interface Connector Pin Assignments, DB-15
Getting Started
SIM984 Isolation Amplifier