10.8
SEL-734 Meter Instruction Manual Date Code 20090730
Communications
Communications Protocols
For long-distance communications up to 80 kilometers and for electrical
isolation of communications ports, use the SEL-2800 family of fiber-optic
transceivers. Contact SEL for more details on these devices.
Communications Protocols
Hardware Protocol
The EIA-232 serial port supports RTS/CTS hardware handshaking. RTS/CTS
handshaking is not supported on the EIA-485 Serial Port 4A.
To enable hardware handshaking, use the SET P command to set
RTSCTS = Y. Disable hardware handshaking by setting RTSCTS = N.
If RTSCTS = N, the meter permanently asserts the RTS line.
If RTSCTS = Y, the meter deasserts RTS when it is unable to receive
characters.
If RTSCTS = Y, the meter does not send characters until the CTS input is
asserted.
Software Protocols
SEL-734 communications protocols:
➤ SEL ASCII
➤ SEL Distributed Port Switch Protocol (LMD)
➤ SEL Fast Meter
➤ SEL Compressed ASCII
➤ MV-90 Translation
➤ Modbus
®
RTU
➤ Modbus
®
TCP
➤ MIRRORED BITS
®
Communications
➤ Distributed Network Protocol (DNP3) (Optional)
➤ Telnet
Table 10.7 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
Courtesy of NationalSwitchgear.com
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