DTC Connection to VMS Decserver 700

[Jim Messenger]

We are having problems connecting a 16rx DTC to a Decserver 700.

We've proved that messages are being sent over both terminals, but can't get the two units to talk to each other !!!!!

Therefore it must be the cable in between them.

The DTC as an 8 port connector on the back so we've got an RJ45 connection trying to connect to another RJ45 connection.

Can anyone tell me what the pinouts for the cable should be !!!!!

Regards in Advance

Mark

[harry d brown jr]

If it's RJ45 to RJ45, it's either straight through or a cross-over, so you have only two wiring possibilities!

live free or die
harry

[Dave Unverhau_1]

Jim,

It sounds like you need the pinout for the modular 8-pin SERIAL port connection. Here it is:

DTC 8-pin modular Serial pinout:

Pin number Signal

1 RD
2 n/c
3 TD
4 CTS
5 RTS
6 SGND
7 n/c
8 n/c

When fabricating serial DTC cables using 8-pin modular connectors, it is recommended to maintain a twisted pair with RD and SGND and
another twisted pair with TD and a duplicate of SGND or with a modem control signal. Do not form a pair with TD and RD.

I got this info from the DTC Racking and Cabling manual, available at http://docs.hp.com

The link to the manual is:

http://docs.hp.com/hpux/pdf/5961-6410.pdf

Good luck with your cabling!

Dave

[Wodisch]

Hi Jim,

at first glance I see three different areas of possible problems:

1) cable - that's what the others were writing about.

2) usage of the serial port: even though you might have 8 pins (and wires) UN*X may use only three of them (terminal-connection: TD/RD/SGND), four of them (TD/RD/SGND/DTR), up to all eight (TD/RD/SGND/DTR/DSR/CTS/RTS/RI). This depends on which device file you have generated (names like "cul0p0" or "cua0p0" or "tty0p0" or "ttyp0p0d") as UN*X uses different minro device numbers (and hence device files) to associate that method of handling. Do an "lssf" onto your device files to learn what you've got.

3) serial communication parameters: start bits, stop bits, data bits, handshake (SW or HW), parity, and more. Read the man pages about "gettydefs" and "stty" for more details.

So, *how* do you use the connections (over the DTC)?
The commands in use would be helpful, as would be the output of "stty -a < /dev/your-device-file" for each of them.

Regards,
Wodisch