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5
CONNECTIONS
The Hydra uses a bi-directional 2-wire RS-485 data bus to communicate to the
slave devices. The device at each end of the network must be terminated. An
8-DIP switch on the rear of the unit is used to set the termination. Switch No.
8 is the terminal switch. When set to ON, the device is terminated. When set
to OFF, it will be un-terminated.
Figure 2: Regcom Rear Panel
RJ45
PIN 4 (+)
PIN 5 (-)
RJ45
PIN 4 (+)
PIN 5 (-)
Table 3: RS-485 Network
Data Cable Wiring
(120 Ohm impedance terminated)
PIN 1
PIN 2
PIN 3
PIN 4
PIN 5
PIN 6
PIN 7
PIN 8
RS-485 (+)
RS-485 (-)
Table 2: RJ45 Pin-Out
PIN 1
PIN 2
PIN 3
PIN 4
PIN 5
PIN 6
PIN 7
PIN 8
PIN 9
RX (RS-232)
TX (RS-232)
GROUND
Table 1: DB-9 Pin-Out