Allen-Bradley Rockwell Automation 857 User Manual page 234

9-6
Connections
857-UM001A-EN-P – July 2009
X3-1
EXT TX
X3-2
EXT RX
X3-3
REMDTE TX
X3-4
REMDTE RX
X3-5
+8Vdc
X3-6
X3-7
X3-8
LOCAL TX
X3-9
LOCAL RX
X3-10
X3-11
UART_OUT
Sync.in
X3-12
OPTx_ID X3-13
X3-14
Internal connection
Figure 9.3 – Internal connection to communication modules
The internal connection of the communication modules contain the
RX/TX signals from the communication ports, general output
(UART_OUT), clock sync/general input (Sync.in) and OPTx_ID for
module detection.
31mm
31 mm
Figure 9.4 – Communication Module with a height of 31 mm
External connector, signal levels
depend on the type of the
module
18 mm
External connector
Internal 14-pin connector, RS-
232 signal levels for REMOTE,
LOCAL and EXTENSION ports
Figure 9.5 – Communication Module with a height of 18 mm
The device has a 31mm high "slot" for Communication option 1 and
18mm high "slot" for Communication option 2. The option modules
are either 31mm or 18mm high, the 18mm modules can be used
either in the 31mm or 18mm slot.
18mm