TS-MULTI-104

TS-MULTI_104

Product Page
Documentation
Multitech Universal Socket Products
Operating Temperature
-40C
85C
Some modems have smaller operating temperatures
Mechanical
96mm X 89mm
Weight 20.4 (approx)

Overview

The TS-MULTI_104 is a PC/104 device that carries Multitech socket modems. It uses a standard 16550 driver, and is designed to work with nearly all PC/104 hosts.

Getting Started

The TS-MULTI_104 will use the standard 16550 driver provided by the host system, but the driver will need to know the COM address and IRQ which are both selected by the onboard jumpers.

This example is for a TS-7800 with only IRQ6 on. If you have K1 populated you should also have the "1.8MHz" jumper on to get started.

# If you are in Debian the next 2 lines will turn on the PC104 bus
. /initrd/ts7800.subr
pc104on
modprobe ts7800_isa16550 irq=6 io=0x3F8

To view if it loaded correctly, run 'dmesg' and you should find a line similar to this:

serial8250: ttyS2 at MMIO 0xee0003f8 (irq = 71) is a 16550A

So in this case the COM device will be /dev/ttyS2. You can use a terminal emulator like minicom or picocom to quickly test communication. Upon typing "AT" and pressing enter, the modem should respond with OK.

Features

COM Port Address

COM	I/O	COM1 Jumper	COM2 Jumper	COM3 Jumper
COM1	0x3F8	OFF	OFF	OFF
COM1	0x3F8	ON	OFF	OFF
COM2	0x2F8	OFF	ON	OFF
COM3	0x3E8	OFF	OFF	ON
COM4	0x2E8	ON	OFF	ON
COM5	0x3A8	OFF	ON	ON
COM6	0x2A8	ON	ON	ON

PLD

The TS-MULTI_104 board contains a PLD with 1 register. This is available at offset 0x140, or if you depopulate

IRQ Selection

The IRQ can be selected by the jumpers labelled IRQ3 through IRQ7. On most of our SBCs only IRQ5-7 are used.

Faster Data Rates

When used with the GPRS modems and those requiring a maximum baud rate of 115200, you can use the PC104 clock to generate a 18.4MHz clock needed for the 16550. When using faster modems like the H4 for an HSDPA connection, K1 can be populated with a 14.7456MHz crystal. This will allow you to reach baud rates up to 921600. If you have K1 populated, you can set the jumper 1.8MHz to use the PC104 clock for standard baud rates.

To set a custom baudrate in Linux you would typically use the setserial command. When the spd_cust baud rate it set Linux will re-purpose 38400 to use your custom baud rate.

Common Baud Rates

Divisor	Rate
1	921600
2	460800
3	307200
4	230400
5	184320
6	153600
7	131657
8	115200

Larger divisors will also work, but this should cover the common range. Using the setserial command you can specify the divisor. For example, to reach 460800

# ttyS4 is an example, but check "dmesg" after loading
# your 16550 driver to get the device
setserial /dev/ttyS4 spd_cust baud_base 921600 divisor 2

Note:

Custom baud rates can be up to 5% off of your target baud rate, and communication will still be possible with most devices.

In your linux application you would set the baud rate to 38400, and access it as normal which will actually communicate at your faster speeds. The Linux Documentation Project has more details on serial programming.

Product Notes

FCC Advisory

This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly (that is, in strict accordance with the manufacturer's instructions), may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a Class A digital device in accordance with the specifications in Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference when operated in a commercial environment. Operation of this equipment in a residential area is likely to cause interference, in which case the owner will be required to correct the interference at his own expense.

If this equipment does cause interference, which can be determined by turning the unit on and off, the user is encouraged to try the following measures to correct the interference:

Reorient the receiving antenna. Relocate the unit with respect to the receiver. Plug the unit into a different outlet so that the unit and receiver are on different branch circuits. Ensure that mounting screws and connector attachment screws are tightly secured. Ensure that good quality, shielded, and grounded cables are used for all data communications. If necessary, the user should consult the dealer or an experienced radio/television technician for additional suggestions. The following booklets prepared by the Federal Communications Commission (FCC) may also prove helpful:

How to Identify and Resolve Radio-TV Interference Problems (Stock No. 004-000-000345-4) Interface Handbook (Stock No. 004-000-004505-7) These booklets may be purchased from the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402.

Limited Warranty

See our Terms and Conditions for more details.