Re: [ts-7000] TS-7800 Serial Port Names and Characteristics

[Frank <>]

ttyS0 and ttyS1, as you've discovered, work as you'd expect on the COM1 and COM2 headers. 

The TS-UARTs aren't enabled at boot by default.  You need to 'modprobe tsuart7800'. 'dmesg' will then give you the device names.  The ports are named /dev/ttts0 through /dev/ttts9, matching the '#' column in the TS-7800 Manual (the /dev/tt8s0 through /dev/tt8s9) I think are the 9-bit enabled devices).

In the table, the pinouts of the Tx and Rx pins are the important ones.  If you make (or have) a 10-pin IDC cable with a DB9 connector with pin-to-pin connections (i.e header pin 1 to DB9 pin 1), then you'll get /dev/ttts4 out on the COM3 header with a standard serial cable. Other ports need to be wired accordingly.

Regarding /dev/ttyS2, I have a TS-MODEM2 set up as COM3/4, IRQ 6, and it shows up on /dev/ttyS2 (after setting the PC-104 pins to ISA mode, and modprobing ts7800_isa16550).

Let me know if this helps.

-Frank

mikeciaraldi wrote:

My TS-7800 is working pretty well, but I have run into a funny
problem. Two actually!

1) What is the correspondence between the hardware port numbers as
given in the table in the TS-7800 manual, and the device names under
Linux?

I know that the two serial ports implemented in the processor chip are
/dev/ttyS0 and ttyS1

But for the 10 serial ports implement4ed in the FPGA, the port numbers
run 0 through 9. What are their corresponding /dev names?

Do I have to do anything special to activate the ports? I see in the
manual about the various registers, but I was wondering what Linux
does by default.

2) I only need one serial port for the user console, but I need
several to connect to various sensors. I went into /etc/inittab and
disabled the getty on ttysS1. Then I was able to use C-Kermit to talk
to a device wired to COM2. But when I wired a device to COM3 and tried
to open /dev/ttyS2, Kermit refused because the port was not a terminal
device. Specifically, the code calls isatty(), and it returns false.

Thanks!

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