Introduction
This tutorial is intended as a supplement to the original manuals for the products. Therefore, use it to familiarise yourself with the products and not as a complete installation guide.
Product Information
Westermo's TD-22 is a 11 bit industrial modem with a maximum transmission rate (transfer) and mode flows of between 2400 baud, and a maximum communication speed of 19,200 baud.
Procedure for setting up Westermo TD-22
- Start up the hyper terminal on the PC.
- Preferences: Features
-Connecting with = Direct to COM1 (or another serial port)
-Configuration = 9600, 7, Equal, 2, No (baud rate, databit, parity, stop bit, flow control) - TD-22 must be set up with a set dip-switch configuration before it is connected to the power
SW3: 1 = ON, SW4: 2,3,5,8 = ON, SW5: 1.3 = ON.
The remaining switches should be OFF. This configuration provides the same setup as the hyper terminal. - Connect to the modem on the COM port 1 (the same port that is used in the hyper-terminal). The modem does not need to be connected to a phone line.
- Set up the modem with the following commands:
AT Checks if the modem is connected.
AT & F Retrieves the modem settings.
AT & D0 Indicates use of DTR.
(AT & K0 Indicates use of flow control *)
ATS0 = 1 Auto answer on the first ring.
AT & W Save / layout of EEPROM.
Each entry provides an OK response from the modem in the hyper terminal window. - The modem is now initialized / set up.
* Recommendation for bad telephone lines - Do not connect pins 4 and 5 on the TD-22 with pins 4 and 5 (respectively) on the PLC, even if the cable requires this.
NB! Recipe was tested on a TD-32 modem with SW5: 4 = ON, instead of 1 and 3. This allows a transmission speed of 9,600 baud between moderate flows, which was previously 2400 baud with TD-22. The following command answers given by connection: TD-32: CONNECT 9600/REL - MNP (or - LAPM) or TD-22: CONNECT 2400/REL - MNP (or - LAPM) Tested against both ports, both on a CQM1-CPU43 and a C200HX-CPU64.