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APPENDIX B — CABLING SPECIFICATIONS
This appendix provides interface-cabling guidelines for the OM 2000.
RS-232 DB9 Interface Cabling
The OM 2000 is configured as a DTE:
Connector type
DB9 male shielded connector with screw locks
Cable type
Shielded twisted pair
Baud rate
Port 1: 9600 bps asynchronous (fixed), 8/N/1
Port 2: 19.2K maximum asynchronous (no sync mode), 8/N/1; Port 2
supports 300, 600, 1200, 2400, 9600, and 19200 bps
Table B-1 — RS-232 DB9 Interface Connector Pinout
Pin Number
Signal
Direction
Description
1
RLSD (DCD)
In
Receive Line Signal Detector (Data
Carrier Detect)
2
RX In
Receive
data
3
TX Out
Transmit
data
4
DTR Out
Data
Terminal
Ready
5
SG (Shield)
Signal Ground (Shield)
6
DSR
In
Data Set Ready
7
RTS
Out
Request To Send
8
CTS
In
Clear To Send
9
RI In
Ring
Indicator
The OM 2000 can either source or sink the transmit clock. This is a configuration
selection. Sinking the clock is needed when sending data through a modem by a
network T1 line. In this case, the modem sources a clock that is locked to the
network. The OM 2000 sinks the clock and sources data to the modem to be sent to
the network.
