D.10
SEL-787 Relay Instruction Manual Date Code 20081022
DNP3 Communications
DNP3 in the SEL-787
Modem Support
The SEL-787 DNP implementation includes modem support for serial ports.
Your DNP3 master can dial-in to the SEL-787 and establish a DNP3
connection. The SEL-787 can automatically dial out and deliver unsolicited
DNP3 event data.
When the device dials out, it waits for the “CONNECT” message from the
local modem and for assertion of the device CTS line before continuing the
DNP transaction. This requires a connection from the modem DCD to the
device CTS line.
NOTE: Contact SEL for information
on serial cable configurations and
requirements for connecting your
SEL-787 to other devices.
You can either connect the modem to a computer and configure it before
connecting it to the SEL-787, or program the appropriate modem setup string
in the modem startup string setting MSTR. You should use the PH_NUM1
and (optional) PH_NUM2 settings to set the phone numbers that you want the
SEL-787 to call. The SEL-787 will automatically send the ATDT modem dial
command and then the contents of the PH_NUM1 setting when dialing the
modem. If PH_NUM2 is set, the RETRY1 setting is used to configure the
number of times the SEL-787 tries to dial PH_NUM1 before dialing
PH_NUM2. Similarly, the RETRY2 setting is the number of attempts the
SEL-787 tries to dial PH_NUM2 before trying PH_NUM1. MDTIME sets the
length of time from initiating the call to declaring it failed because of no
connection, and MDRET sets the time between dial-out attempts.
NOTE: RTS/CTS hardware flow
control is not available for a DNP3
modem connection. You must use
either X-ON/X-OFF software flow
control or set the port data speed
slower than the effective data rate of
the modem.
The settings PH_NUM1 and PH_NUM2 must conform to the AT modem
command set dialing string standard, including:
➤ A comma (,) inserts a four second pause
➤ If necessary, use a 9 to reach an outside line
➤ Include a 1 and the area code if the number requires long
distance access
➤ Add any special codes your telephone service provider
designates to block call waiting and other telephone line
features.
DNP3 Settings
The DNP3 port configuration settings available on the SEL-787 are shown in
Table D.7. You can enable DNP3 on Ethernet Port 1 or on any of the serial
Ports 2 through 4, up to a maximum of three concurrent DNP3 sessions. Each
session defines the characteristics of the connected DNP3 Master, to which
you assign one of the three available custom maps. Some settings only apply
to DNP3 LAN/WAN, and are visible only when configuring the Ethernet Port.
For example, you only have the ability to define multiple sessions on port 1,
the ethernet port. Likewise, settings applicable to serial DNP3 are visible only
when configuring a serial port.
Table D.7 Port DNP3 Protocol Settings (Sheet 1 of 2)
Name Description Range Default
EDNP
a
Enable DNP3 Sessions 0–3 0
DNPNUM
a
DNP3 TCP and UDP Port 1–65534 20000
DNPADR Device DNP3 address 0–65534 0
Session 1 Settings
DNPIP1
a
IP address (zzz.yyy.xxx.www) 15 characters “”
DNPTR1
a
Transport protocol UDP, TCP TCP
DNPUDP1
a
UDP response port REQ, 1–65534 20000
REPADR1 DNP3 address of the Master to send messages to 0–65519 1
DNPMAP1 DNP3 Session Custom Map 1–3 1
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