Section 3: Operation
NetClock/GTP Instruction Manual
Page 3-7
3.2.5 RS-232
Serial
Communication Ports
The NetClock/GTP has two serial communication ports labeled Serial Comm 1
and Serial Comm 2. These ports provide an ASCII RS-232 data stream in the
selected data format. There are five time data format selections and one position
data stream in NMEA 0183 format available. Refer to Section 3.3 for a complete
description of each data format. In addition to data formats, baud rate, UTC time
difference and operation mode of both ports are selectable. A port may be
enabled to output when interrogated by the connected device or continuously
every second.
When using the Serial Comm ports in the interrogation mode, any keyboard
symbol, number or upper case letter may be configured to request the time. The
factory default request character is a capital letter T. NetClock/GTP responds
with an asterisk (*) to all invalid commands or characters received. Do not follow
a time request character with a line terminator (carriage return, enter, etc.).
The serial communication ports are configured by the commands
SER1
and
SER2
. Refer to Section 4,
Software Commands
, for a complete description of
these commands.
The Serial Comm connectors are 9-pin series D females. Connector pin
numbering is shown in Figure 3-4. Serial Comm pin assignments are listed in
Table 3-2.
FIGURE 3-4 SERIAL COMM PIN NUMBERING
PIN SIGNAL I/O
DESCRIPTION
2 RXD O
Receive
Data
3 TXD I
Transmit
Data
5 GND -
Signal
Common
6
DSR
O
Data Set Ready
7
RTS
*
Request to Send
8
CTS
*
Clear to Send
*Pins 7 and 8 are connected together internally.
TABLE 3-2 SERIAL COMM PIN ASSIGNMENTS
