Basler Electric DECS-400 - Manual (Page 142)

130 9369700990 Rev R
Communication Ports
DECS-400 units have five communication ports: Com 0, Com 1, Com 2, Com 3, and J1.
Com 0, located on the front panel, is a female, DB-9, RS-232 connector that is intended for short-term,
full-duplex, ASCII communication with a PC.
Com 1, located on the rear panel, is a half-duplex, RS-485 port. When redundant DECS-400 units are
used, Com 1 is used to communicate (via ASCII protocol) with a second DECS-400. Com 1 connections
are made through screw terminals. If shielded cable is used, terminal D3 can be used for the shield
connection.
Com 2, located on the rear panel, is a half-duplex RS-485 port that communicates via Modbus protocol.
Com 2 connections are made through screw terminals.
J1, located on the rear panel, is an RJ-45 jack that connects to an internal, FCC part 68 approved
modem.
Terminal assignments for Com 1 and Com 2 are listed in Table 14. Interconnection diagrams for the
communication ports are provided in Communication Connections.
Table 14. Com 1 and Com 2 Terminals
Terminal Description
D3 (GND) Shield connection
D4 (A1) Com 1 RS-485 Send/Receive A terminal (ASCII protocol)
D5 (B1) Com 1 RS-485 Send/Receive B terminal (ASCII protocol)
D6 (C1) Com 1 RS-485 Signal Ground terminal (ASCII protocol)
D9 (A2) Com 2 RS-485 Send/Receive A terminal (Modbus
™ protocol)
D10 (B2) Com 2 RS-485 Send/Receive B terminal (Modbus
™ protocol)
D11 (C2) Com 2 RS-485 Signal Ground terminal (Modbus
™ protocol)
Control Outputs
The DECS-400 can supply either an analog voltage or current excitation control output. The voltage
output can be user-configured to supply a setpoint control signal over the range of 0 to +10 Vdc or –10
Vdc to +10 Vdc. The current output supplies a setpoint control signal over the range of 4 to 20 mAdc. If
shielded cable is used, terminal D12 should be used for the shield connection. Table 15 lists the control
output terminals.
Table 15. Control Output Terminals
Terminal Description
D12 (GND) Shield connection for control output
D13 (IC+) Current control positive terminal
D14 (VC+) Voltage control positive terminal
D15 (RTNC) Common, return terminal for control output
Metering Outputs
The DECS-400 has two programmable, analog meter drivers. Either driver output can be user-
programmed to meter a variety of generator and system parameters. Each meter driver supplies an
output over the range of 4 to 20 mAdc. If shielded cable is used, terminal A23 should be used for the
shield connection. Table 16 lists the terminals for the metering outputs.
Table 16. Metering Output Terminals
Terminal Description
A21 (M1+) Meter driver #1 positive terminal
A22 (M1–) Meter driver #1 negative terminal
Installation DECS-400