Kramer Electronics FC-24ETH - Manual (Page 25)

Connecting the FC-21ETH, FC-22ETH and FC-24ETH 21
6.2 Connecting to the Ethernet Controller via RS-232
To connect to the FC-21ETH, FC-22ETH and FC-24ETH via RS-232:

Connect the RS-232, 3-pin, terminal block connectors on the rear panel of
the FC-21ETH, FC-22ETH and FC-24ETH unit via 3-wire cable (pin TX to
pin 2, RX to pin 3, and G to pin 5) to the RS-232 9-pin D-sub port on the
devices to be controlled
6.3 Connecting to a Controlled Device via the RS-485 Port
You can control a device up to 1200m (3900ft) away by using the RS-232/RS-485
port on the FC-21ETH, FC-22ETH and FC-24ETH and setting it to RS-485
operation. To connect via RS-485, you must switch the Serial 1 port on the rear
panel of the FC-21ETH, FC-22ETH and FC-24ETH to RS-485 operation and set
the RS-485 bus termination.
Note: On the dual-use Serial port, the connections are G, B, A in place of G, Rx,
Tx.
To connect a device with an RS-485 port to the FC-21ETH, FC-22ETH and
FC-24ETH:
1. Depress the Serial Select switch on the rear panel of the FC-21ETH,
FC-22ETH and FC-24ETH.
2. Connect the devices as follows:
 Connect the B ( –) pin on the RS-485 port of the PC to the Tx (A) pin on
the RS-485 port on the rear panel of the FC-21ETH, FC-22ETH and
FC-24ETH
 Connect the A (+) pin on the RS-485 port of the PC to the Rx (B) pin on
the RS-485 port on the rear panel of the FC-21ETH, FC-22ETH and
FC-24ETH
 Connect the G pin on the RS-485 port of the PC to the G pin on the
RS-485 port on the rear panel of the FC-21ETH, FC-22ETH and
FC-24ETH