Sec 3120 Setup And Configuration - Sensor Electronics SEC Millenium Series Instruction And Operation Manual

Modbus 3120 Unit Read/Write Registers
· Unit Clock- Write New Time Registers
· Unit Clock- Set New Time Now
· Unit Diagnostics Control (force relays on/off, toggle LEDs to flash)
· Unit- Place into Modbus listen only mode
· Unit- Restore out of Modbus listen only mode

SEC 3120 Setup and Configuration

Pin7
(Bottom View of SEC 3120- Relay Board Connectors)
SEC 3120 Modbus RS-485 Network Connections
· Pin 5 (RS485 B) of the SEC 3120 power and communication connection block P5
is typically connected to a Modbus Master device (RX-) terminal in two-wire
connections. For the EGX-100 Gateway, this would be Pin 4 of the RS485
connection block.
· Pin 4 (RS485 A) of the SEC 3120 power and communication connection block P5
is typically connected to a Modbus Master device (RX+) terminal in two-wire
connections. For the EGX-100 Gateway, this would be Pin 3 of the RS485
connection block.
· The EGX-100 Gateway is connected to the Ethernet using its Ethernet port and
10/100 base T/TX cable to an Ethernet switch.
SEC 3120 16-bit Modbus Manual
For Version 1.2 and above
Pin5 Pin4
Page 6 Of 46
December 2012
Connector
Block P5
Pin1
Sensor Electronics Corporation
P/N 1580282, Rev. 1, 20121228