8 XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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Standard Inputs and Outputs
The following specifications describe the standard (as opposed to optional) inputs and outputs on the
standard configuration of the XLi.
Serial I/O Port
The standard serial data port is a bi-directional EIA standard RS-232C interface. The serial data port is
configured via the Keypad / Display and Standard network port.
Note: Parity - NONE is only available/valid when Data Bits is set to 8.
See “F4 – Serial Port Configuration” on page 52.
NET – Network Port
The Ethernet port interface has a standard RJ-45 connector that provides IEEE 802.3 frame 10/100
Base-T Ethernet. The XLi can optionally be factory configured as a Network Time Protocol (NTP) server,
which can be used to synchronize client computer clocks over a network. This function is only available
with GPS and IRIG B input. See “F100 – Network Port Configuration & XLi Firmware” on page 117.
Interface: RS-232 or RS-422
Data Rates: 1200, 2400, 4800, 9600 and 19200 bps
Data Bits: 7 or 8
Parity: even, odd, or none
Stop Bits: 1 or 2
Connector: Male 9-pin D subminiature
Pin Assignment: 1------N/C
2------Rx (RS-232)
3------Tx (RS-232)
4------N/C
5------GND
6------Rx- (RS-422)
7------Rx+ (RS-422)
8------Tx- (RS-422)
9------Tx+ (RS-422)
Factory settings: 9600, 8, N, 1
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