Model 9289
Spectracom Corporation
NetClock/NTP Network Time Provider Instruction Manual
2-10
2.7
Remote Port and Serial Comm Port Output Pin-outs and
Wiring
This section contains wiring and pin-out information for the rear panel Remote RS-485 and
Serial RS-232 Comm ports.
2.7.1 Serial Comm Ports
The rear panel of the Model 9289 has one RS-232 SERIAL COMM port (two if Option 02 has
been purchased) that are available to synchronize peripheral devices. These ports can provide
RS-232 output data to synchronize external devices that can accept RS-232 Data Formats as
an input.
The Serial Ports can provide RS-232 data in one of two modes. The Interrogation mode
provides a one-time RS-232 time stamp each time that the port receives a request character
from the external device. In between the requests for time, there is no output. The Multicast
mode broadcasts the time stamp every second. The Interrogation mode is the factory default.
This mode should be changed to Multicast mode in the web browser user interface if the
external device being synchronized does not send a request character for the time but rather
just “listens” for the time to be sent every second.
The configuration of the data, including the baud rate, the Data Format, the request character in
the Interrogation mode, Time Zone Offsets and Daylight Saving Time rules is chosen from the
web browser user interface.
The Serial Ports have a standard RS-232 pin configuration as shown in Figure 2-5 and Table
2-2.
Figure 2-5: Serial Port Pin Configuration
PIN SIGNAL I/O DESCRIPTION
2
RXD
O
Receive Data (RS-232 output
data to a device)
3
TXD
I
Transmit Data (RS-232 input
data from a device)
5 GND - Signal
Common
6
DSR
O
Data Set Ready
7
RTS
*
Request to Send
8
CTS
*
Clear to Send
Table 2-2: Serial Port Pin Assignments
5
4
3
2
9
8
7
6
1
Summary of Contents for 9289
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