Cisco DTE Cable for Motorola V.24 link

[Wi Fi]

Hi all!

Most of us uses DCE cable to connect Quantar to Cisco serial port, like Cisco CAB-SS-232FC. And adapter pinout to V.24 Motorola is well-known:

 

Pin #	Motorola V.24 Port	Cisco Cable  Pin # for  FC(DCE) Cable Only	Cisco  FC (DCE) Cable Signal
1	RCLK	17	RXC
2	RX Line Det	8	DCD
3	TCLK	15	TXC
4	GND	7	GND
5	Data RX	3	RXD
6	Data TX	2	TXD
7	CTS	5	CTS
8	RTS	20	DTR

 

But I am interested in DTE cable(s) usage aka CAB-SS-232MT. It's is similar to FC cable, but have DB25M at the end instead of DB25F. And of course, it have another internal jumper to configure Cisco's serial port to DTE mode instead of DCE.

 

This may seem easy do change a few pins and get pinout for DTE cable and change clocking source at Motorola side after that. But actually is NOT. I have tried many different pinouts (which I tried to create and my friends), but still no luck. Through MT cable I can't get working V.24 link. Spent a few days, tried something like 10 different pinouts, and no luck.

Did someone do it successfully? If YES, can you post working pinout like is specified above?

 

Thanks in advance!

 

--

Art

[Bryan Fields]

On 10/26/17 6:53 PM, Wi Fi wrote:
> This may seem easy do change a few pins and get pinout for DTE cable and
> change clocking source at Motorola side after that. But actually is NOT. I
> have tried many different pinouts (which I tried to create and my friends),
> but still no luck. Through MT cable I can't get working V.24 link. Spent a few
> days, tried something like 10 different pinouts, and no luck.

The DTE cable doesn't have the right lines on it. It will not work, you need
a DCE cable.

Sorry :(

--
Bryan Fields

727-409-1194 - Voice
http://bryanfields.net

[Wi Fi]

Hi Bryan!

Thanks for your input. I really appreciate it and ready to trust you, because you're very well experienced (from what I know). But let me to disagree with you.

Looks like both cables has the same set of lines, 12 unique, including GND. And accordingly to all DCE-DTE theory, the difference is only in signal direction. Cable pinouts attached and it's easy to proof it. Example, It's pretty clear that all lines are in place, including CTS, DCD, DSR, DTR, GND, LTST, RTS, RXC, RXD, TXC, TXCE, TXD.

Please correct me if I am wrong.

Thanks!

--

Art

[Alexander Jessautzki]

Hi,

all the pinouts can be found on the Cisco web page, it is all documented, even the jumpers. If you modify your cable to match the 232FC version it will work, no secret ingredients and no need for spoonfeeding. 

Alex, DC5AJ 

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[Wi Fi]

Alex,

 

I attached pinouts of both cables here, check PDF file in previous post. Those data come off Cisco web site. I am not a dumb or dummy, all pinout was investigated long time ago.

 

And my question is NOT how to modify "MT" cable to "FC" cable, but my question is how to use factory untouched "MT" cable for V.24 connection (because all lines are there at DB25 end). So, I just want to have appropriate DB25F to RJ45F adapter to use with MT cable/DTE port. It's possible in theory, because every Motorola can be DTE or DCE device (it's selected via RSS and/or jumpers; depending on hardware). Quantar and ATAC offers S101/S100 jumper as well as CSS setting, but DIU3000 offers only CSS setting.

 

In theory I can place Motorola device into DCE mode (internal clocking generation) and use DTE cable at Cisco side

--

Art

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