What type of RS232 cable do I need for my lock-in?

RS232 serial ports may be configured as one of two types, these being DTE (data terminal equipment) and DCE (data communications equipment). All SIGNAL RECOVERY lock-in amplifiers are configured as DTE devices, which is the same as most personal computers. Consequently, in order to satisfactorily connect a lock-in amplifier to a computer it is necessary to use a Null Modem (also known as a Modem Eliminator) cable.

The model 5113 preamplifier is however configured as a DCE and hence requires a straight through cable, rather than a null modem type.

For historical reasons units are fitted with one of three types of RS232 serial interface connectors, which when taken with the fact that the serial port on the computer may be fitted with either a 9-pin or 25-pin connector, means that one of eight types of cable will be needed.

The connection diagrams for all eight types of cable are given below and should prove of use to readers with reasonable practical skills who would like to assemble their own interconnecting cables.

Models 5105 and 5106 to computers with 9-pin serial connectors
These units require a 9-pin female to 9-pin female null modem cable

9f9mnlmd.gif (5171 bytes)

Models 5105 and 5106 to computers with 25-pin serial connectors
These units require a 25-pin female to 9-pin female null modem cable.

25f9fnlm.gif (5718 bytes)

Models 5109, 5110, 5209, 5210 and 5302 to computers with 9-pin serial connectors
These units require a 9-pin female to 25-pin male null modem cable.

9f25mnmd.gif (5764 bytes)

Models 5109, 5110, 5209, 5210 and 5302 to computers with 25-pin serial connectors
These units require a 25-pin female to 25-pin male null modem cable.

25f25mnm.gif (5977 bytes)

Models 7220, 7225, 7260, 7265, 7280 and 7310 to computers with 9-pin serial connectors
These units require a 9-pin female to 9-pin male null modem cable.

9f9mnlmd.gif (5171 bytes)

Models 7220, 7225, 7260, 7265, 7280 and 7310 to computers with 25-pin serial connectors
These units require a 25-pin female to 9-pin male null modem cable.

25f9mnmd.gif (5873 bytes)

Model 5113 to computers with 9-pin serial connectors
This unit requires a 9-pin female to 25-pin male cable.

25m9fst.gif (5484 bytes)

Model 5113 to computers with 25-pin serial connectors
This unit requires a 25-pin female to 25-pin male cable

25f25mst.gif (5760 bytes)

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It includes the businesses formerly trading as EG&G Instruments (Signal Recovery),
EG&G Signal Recovery and PerkinElmer Instruments (Signal Recovery)

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