Appendix C -- I/O Connectors--Monitor Connector
11 - 2
A special cable is used to connect the instruments that will be synchronized. The cable has a Master
connector on one end and a variable number of Serf connectors.
Gamry sells three standard Master-Serf cables:
• 985-132 One Master and One Serf
• 985-133 One Master and up to Three Serfs
• 985-134 One Master and up to Seven Serfs
All of these cables have the Master end of the cable identified by a large M on the DIN connector. Note that a
cable can be used with some instruments missing, so the eight instrument Master -Serf cable can be used for
one Serf, two Serfs, three Serfs,..., seven Serfs.
Note
We recommend that you always plug the Master and last Serf ends of the cable into a
potentiostat. You can leave of the DIN connectors in the middle of the cable
disconnected.
The Master-Serf connection scheme sends 24 MHz complex clock signal from the Master to the Serfs using a
daisy-chained low voltage differential signal (LVDS). Data acquisition pulses are imbedded in the clock signal.
DC pins in the DIN connector are used to detect all cable connections and most importantly detect the Master
end of the cable.
We ask that you use Gamry supplied cables for all Master - Serf synchronized systems. The cable uses a
differential pair that requires controlled impedance making user construction of a cable very difficult.
Monitor Connector
The Monitor Connector is located on the Interface 1000 Front Panel. It is an 8-pin round mini-DIN connector.
One possible mating connector is from CUI Inc. part number MD-80. The pin out of the Monitor Connector is
shown in Table C-2.
Table C-2
Monitor Connector
Pin Name Use
1 Unreg +5 V
An unregulated source of +5 V. 10 Ω output impedance.
2 Signal Ground A very high quality ground. Signals are relative to this ground
3 Power Ground Ground used when active circuits are needed. Power circuits from
Pin 1 to Pin 3.
4 Signal Ground A very high quality ground. Signals are relative to this ground
5 E_sig E Monitor Signal
6 EXT_SIG External Signal In
7 I_Sig I_Monitor Signal
8 Signal Ground A very high quality ground. Signals are relative to this ground
I Monitor Signal
The I Monitor signal represents the output of the Interface 1000 current measurement circuit. It can be treated
as a 2-wire differential signal with the negative side connected to the Interface 1000 Signal Ground. With the
exception of the filtering described below, it is the raw signal with no offset or gain applied. The effective
bandwidth of the current signal falls as you reach the nA and pA current ranges. IE Stability capacitors further
slow the response.
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