Setting Change Permission And Relay Password - ABB REL 301 Instruction Leaflet

I.L. 40-386.4
232C standard describes mechanical, electrical, and functional characteristics. This standard is
published by the Electronics Industry Association (EIA) and use of the standard is voluntary but
widely accepted for electronic data transfer. ABB relay communications follows the RS-232C
standard for non-network data communication.
Although the RS-232C standard does not specify a connector shape, the most commonly used
is the "D" shape connector. As stated in Section 4.6.2 above, all ABB relay communication con-
nectors are of the "D" shape (such as DB-25S).
Data communication devices are categorized as either Data Terminal Equipment (DTE) or Data
Communication Equipment (DCE). A DTE is any digital device that transmits and/or receives
data and uses communications equipment for the data transfer. DCE's are connected to a com-
munication line (usually a telephone line) for the purpose of transferring data from one point to
another. In addition to transferring the data, DCE devices are designed to establish, maintain,
and terminate the connection. As examples, a computer is a DTE device and a modem is a DCE
device.
By definition the connector of a DCE is always female (usually DB-9S or 25S). Similarly, DTEs
are always male (usually DB-9P or 25P). These definitions apply to the equipment being con-
nected and to the connectors on the interconnecting cables.
One additional piece of hardware that is required, in some applications, is a "null" modem. Null
modem's function is to connect the transmit line (TXD), pin 2 by RS-232C standard, to the re-
ceive line (RXD), pin 3. A null modem is required when connecting like devices. That is DTE to
DTE or DCE to DCE. A DCE to DCE, example, where a null modem is required, is the connec-
tion of a 25 pin, PONI to a modem.
A null modem function can be accomplished in the connecting cable or by separate null modem
package. That is, by using a conventional RS-232C cable plus a null modem. One type of null
modem, available from electronics suppliers, is B & B Electronics Type 232MFNM.
4.6.5

Setting Change Permission and Relay Password

To gain access to certain communication port(s) functions, the REL 301/302 must have the re-
mote setting capability permission "Rem. Set" set to "Remote Allowed" and knowledge of the
relay password is required. All communications port functions listed below require "Rem. Set"
set to "Remote Allowed" before the actions can be performed:
Update/Change Settings
Update Programmable Contact Settings
Enable Local Settings (capability)
Disable Local Settings (capability)
Activate Output Relays (contact testing function)
Access control, both setting permission and password knowledge is required for all communi-
cation port options.
Before attempting any of the above functions, the setting of "Rem. Set" must be verified via the
front panel MMI. Using the setting change procedure in Section 4.4.2.1, verify or change "Rem.
Set" such that it is set to "Remote Allowed".
Using comm. port communications, the ability to change settings from the MMI can be dis-
abled.The RCP, Password Menu Choice "Disable Local Settings" when selected, will block set-
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