Will this work with slc 500 processor?

Any null modem cable with at least simple handshaking (TX/RX crossed) will work with the SLC 500 and ML1400 over DF-1 protocol. Go shielded if you can. (I'm an Industrial Electrician who's worked with both of these PLCs.)

Is this a crossover cable or straight thru?

Your question is more inline with a Cat-5 cable, not a null modem cable.

Are the wires stranded or solid?

The wires in SCNM9FF are stranded. Matt, StarTech.com Support

You didn't answer the question on handshaking. Does it support full handshaking, partial handshaking, loopback handshaking or no hardware handshaking?

We apologize if we missed part of a previous question. The SCNM9FF is a simple Null Modem cable with all 9-pins connected through the cable. While it doesn't actively participate in handshaking of any kind due to there not being a chip in the cable, as long as both of your devices support the same protocols there should be no problems using whatever hand-shaking you need. Matt, StarTech.com Support

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Description

🔗 Connect the classics, power your productivity.

BUILT TO LAST - Durable construction designed for consistent, long-lasting performance in professional setups.
SEAMLESS SERIAL SYNC - Effortlessly transfer files between PCs or connect legacy devices with zero hassle.
PLUG PLAY PRECISION - DB9 female-to-female connectors ensure instant compatibility with your serial peripherals.
LEGACY TECH MODERN EDGE - Perfect for connecting modems, printers, and other serial devices in today’s hybrid workspaces.
EXTENDED REACH NO LIMITS - 10 feet of premium cable length lets you position devices exactly where you need them.

The StarTech.com SCNM9FF is a 10-foot DB9 female-to-female RS232 serial null modem cable designed for reliable, high-quality data transfer and peripheral connectivity. Ideal for professionals needing seamless serial communication between PCs, modems, and printers, it combines durable build quality with flexible length to support legacy devices in modern work environments.

Specifications

Brand	StarTech
Connector Type	DB9
Cable Type	Serial
Compatible Devices	Modem, PC, Printer
Recommended Uses For Product	Data Transfer, Connecting Peripheral Devices
Connector Gender	Female-to-Female
Shape	Round
Number of Pins	9
Net Quantity	1.0 count
Item Weight	0.32 Pounds
Specification Met	FCC
Indoor/Outdoor Usage	Indoor
Wattage	50 Watts
Outer Material	Other
Manufacturer	STARTECH.COM
UPC	065030772303
Global Trade Identification Number	00065030772303
Item Height	0.01 Inches
Item Width	0.01 Inches
Product Dimensions	304.8 x 0.03 x 0.03 cm; 145.15 g
Batteries	1 A batteries required.
Item model number	SCNM9FF
Processor Count	1
Wireless Type	802.11bgn
Are Batteries Included	No
Lithium Battery Energy Content	2.6 British Thermal Units (BTUs)
Lithium Battery Weight	0.5 Milligrams
Number of Lithium Ion Cells	7
Number of Lithium Metal Cells	7
Country of Origin	USA
Item Weight	145 g

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