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
PIN 1 | |
PIN 2 | RX (RS-232) |
PIN 3 | TX (RS-232) |
PIN 4 | |
PIN 5 | GROUND |
PIN 6 | |
PIN 7 | |
PIN 8 | |
PIN 9 | |
Table 1: DB-9 Pin-Out
PIN 1 | |
PIN 2 | |
PIN 3 | |
PIN 4 | RS-485 (+) |
PIN 5 | RS-485 (-) |
PIN 6 | |
PIN 7 | |
PIN 8 | |
Table 2: RJ45 Pin-Out
(120 Ohm impedance terminated)
RJ45 | RJ45 | |
PIN 4 (+) | PIN 4 | (+) |
PIN 5 (-) | PIN 5 | (-) |
Table 3: RS-485 Network
Data Cable Wiring
