Null Modem Cable

Appendix: Cables and Pin Assignments
Null Modem Cable

The following Null Modem Cables are required to control the following instruments. For information about the pin assignments and part numbers of the null modem cables that are available from Dionex, refer to the corresponding sections below.

Instruments for which a null-modem cable with single pseudo handshake is required:

HP 1050

Agilent 6890 GC

ESA Coulochem II Electrochemical Detector

Gilson 231XL, 232XL, 233XL Autosamplers (Old Device Driver)

Nelson Interfaces (Types 950, 960, and 970)

Perkin Elmer Autosystem (XL) GC

Soma 3710 UV Detector

Instruments for which a completely connected null modem cable is required :

PP-150 Preparative HPLC Pump

Merck Hitachi LaChrom HPLC System

Merck Hitachi L7100 Pump

Merck Hitachi L7200 Autosampler

Merck Hitachi L7250 Autosampler

Perkin Elmer Series 200 Pump

Perkin Elmer Clarus 500 GC

Shimadzu LC-10A/LC-20A HPLC Systems

Shimadzu LC-2010 HPLC System

Shimadzu GC 2010/2014 GC Systems

Instruments for which a null-modem cable with pseudo handshake on both ends is required:

Perkin Elmer Series 200 Diode Array Detector

Pin Assignment(also, refer to Connecting Devices via RS-232)

Null-modem cable with single pseudo handshake:

Instrument			PC
9-pin female connector	25-pin female connector		25-pin female connector	9-pin female connector
2	3	-----------	2	3
3	2	-----------	3	2
5	7	-----------	7	5
			4-5	7-8

Completely connected null modem cable:

Instrument			PC
9-pin female connector	25-pin female connector		25-pin female connector	9-pin female connector
Instead of the pseudo handshakes (7-8 and 4-5), the following assignments are realized for the fully connected null modem cable:
1		-----------		4
4		-----------		1
7		-----------		8
8		-----------		7
9		-----------		9
S		-----------		S

Null modem cable with pseudo handshake on both ends:

Instrument		PC
9-pin female connector		9-pin female connector
4-6	------------
7-8	------------
2	------------	3
3	------------	2
5	------------	5
	------------	4-6
	------------	7-8

Tip:

Do not confuse crossover null modem cables with the non-crossover Modem Cable (1:1 RS cable)!

Dionex Part Numbers

The completely connected null modem cable is available as 9-pin to 9-pin cable:

1310.2263 null modem cable

The following null modem cables with pseudo handshake on one end are available:

9-pin to 9-pin:

8914.0129 for RS cable RU (2.5 m)
8914.0130 for RS cable RU (5 m)
8914.0131 for RS cable RU (10 m)

25-pin to 9-pin:

8914.0103A for RS cable RU (2.5 m)
8914.0120 for RS cable RU (5 m)
8914.0121 for RS cable RU (10 m)

If necessary, use an adapter to connect the cable to a 25-pin socket. These null modem cables have been slightly modified to ensure data transmission even with hardware handshaking enabled. However, the above hardware handshake is not realized.

For information about other connections, refer to the installation instructions for the device. (Also, refer to Installing and Controlling Third-Party Devices.)

Tip:

The null modem cable with pseudo handshake on one end is almost identical with the Dionex/LC Packings: Solvent Organizer Cable that is required for the Dionex/LC Packings UltiMate Capillary/Nano HPLC System. However, do not confuse these two cables; the Solvent Organizer Communication Cable provides an additional connection from pin 1 to pin 6 on both connectors!