Why can’t I assign an IP address through the serial port?

1. The Highspeed series of Com-Servers have serial combination interfaces which can be reconfigured between RS232, RS422 and RS485 via a DIP switch. All other Com-Servers can be optionally configured by means of RS422 / 485 or in some cases also using 20 mA modules. It should therefore be checked first whether the interface of the computer being used and that of the Com-Server are the same.
   

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2. As a standard ex works, the Com-Servers are pre-set to the RS232 interface, i.e. configured with an RS232 module. A so-called “rotated” or “null modem cable” must be used as a connection cable to a DTE-assigned 9-pole PC-COM port. Generally, cables used for connecting a modem are wired one-to-one and are therefore unsuitable.
3. Regardless of the serial transmission parameters set for normal operation, the Com-Server expects for entering the “x” characters (=ASCII 120) on boot-up always the transmission format 9600 baud, 8 data bits, no parity.
4. The terminal program used should be configured to “no Handshake” for assigning the IP address. Although the Com-Server sets its handshake outputs RTS and DTR to enable level upon starting, non-fully wired serial cable can cause problems. For serial IP assignment we recommend using our tool Easyterm. Alternatively, it is of course also possible to use other serial terminal programs, such as e.g. Hyperterminal with direct connections to the relevant COM port.
5. The Com-Server responds only to lower-case characters “x” (=dec 120 = hex 78). If the CapsLock is inadvertently selected, the received characters will thus be ignored.

Additional information:

Goto Category: Com-Server
Manual for Com-Server Highspeed

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