6-10 Settings Date Code 20010518
SEL-2020 Instruction Manual
Table 6.4: SET P Port Communications Settings Information (continued)
Setting Comment
CD_CTS
Prompt. Modem Carrier Detect connected to CTS input (Y/N).
Description. If you are using an external modem which has its Carrier Detect (CD)
output connected to the SEL-2020 CTS input (such as with SEL-C222 cable), set this to
Y. Otherwise, set it to N.
BAUD
Prompt. Baud Rate (300, 600, 1200, 2400, 4800, 9600, 19200, 38400).
Description. You enter the baud rate this port will communicate at. Port F limits are
300 to 9600 baud. Only ports designated masters may use 38400 baud. Automatically
set if auto-configured.
DATABIT
Prompt. Number data bits (7,8).
Description. You enter the number of data bits this port requires for communication.
Port F is fixed at 8 data bits with no parity or 7 bits with parity. Figure 6.2 illustrates how
this setting influences the EIA-232 character format.
STOPBIT
Prompt. Stop bits (1, 2).
Description. You enter the stop bits this port requires for communication. Port F is
fixed at 1 stop bit. Figure 6.2 illustrates how this setting influences the EIA-232
character format
PARITY
Prompt. Parity (N, O, E, 1, 0).
Description. You enter the parity this port will use in communicating. Port F limited to
parity options N (No), O (Odd), and E (Even). Figure 6.2 illustrates how this setting
influences the EIA-232 character format
RTS_CTS
Prompt. Enable RTS/CTS handshaking (Y/N).
Description. You set to Y (Yes) to enable RTS/CTS handshaking. If LMD Protocol or
Modbus is used, RTS/CTS control is not available. Instead, RTS is driven to control any
external transceiver. (For a definition of RTS/CTS, see Data Flow Control subsection
following this table.) With Modem set to Y (Yes) and CD_CTS set to Y (Yes),
RTS_CTS control is not available.
XON_XOFF
Prompt. Enable XON/XOFF flow control (Y/N).
Description. You set to Y (Yes) to enable XON/XOFF flow control. If PROTOCOL is
set to binary, XON/XOFF flow control is forced to N (No). (For a definition of
XON/XOFF, see Data Flow Control subsection following this table.)
TIMEOUT
Prompt. Port Timeout in minutes (0-30).
Description. The time-out setting is used for two different functions. After a set amount
of idle time expires with the port in transparent mode, transparent mode is automatically
terminated. On Master ports, if this time expires with the port idling, any in-process
command is terminated and the access level is reduced to Level 0. Time-out action will
also disconnect LMD communications and hang up the modem if it is connected. A
value of 0 disables time-out.
WARNING: Use a non-zero timeout value for modem ports. If the modem connection
is unintentionally interrupted, you can call and successfully reconnect TIMEOUT
minutes later.
ECHO
Prompt. Echo received characters (Y/N).
Description. Master Port only - The echo option allows you to decide whether or not
you wish the SEL-2020 to provide character echo to a master device (only printable
characters are echoed). ECHO is always Y (Yes) for Port F.
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