Schweitzer Engineering SEL-351P - Communications Protocol; Hardware Protocol; Software Protocols

10-6 Serial Port Communications and Commands Date Code 990215
SEL-351P Manual Técnico
Table SECTION 10: .3: Serial Communications Port Pin/Terminal Function Definitions
Pin Function Definition
N/C No Connection
+5 Vdc (0.5 A limit) 5 Vdc Power Connection
RXD, RX Receive Data
TXD, TX Transmit Data
IRIG-B IRIG-B Time-Code Input
GND Ground
SHIELD Shielded Ground
RTS Request To Send
CTS Clear To Send
DCD Data Carrier Detect
DTR Data Terminal Ready
DSR Data Set Ready
C OMMUNICATIONS P ROTOCOL
Hardware Protocol
All EIA-232 serial ports on the SEL-351P support RTS/CTS hardware handshaking. RTS/CTS
handshaking is not supported on the EIA-485 Serial Port 1 (Optional).
To enable hardware handshaking, use the SET P command (or front-panel SET pushbutton) to
set RTSCTS = Y. Disable hardware handshaking by setting RTSCTS = N.
If RTSCTS = N, the SEL-351P permanently asserts the RTS line.
If RTSCTS = Y, the SEL-351P deasserts RTS when it is unable to receive characters.
If RTSCTS = Y, the SEL-351P does not send characters until the CTS input is asserted.
Software Protocols
The SEL-351P provides standard SEL protocols: SEL ASCII, SEL Distributed Port Switch
Protocol (LMD), SEL Fast Meter, and SEL Compressed ASCII. In addition, you can order the
SEL-351P with Distributed Network Protocol (DNP) V3.00 as an option. The SEL-351P
activates protocols on a per-port basis.
To select SEL ASCII protocol, use the Access Level 2 SET P command to set the port PROTO
setting to SEL. To select SEL Distributed Port Switch Protocol (LMD), set PROTO = LMD. To
select DNP protocol, set PROTO = DNP.