Symmetricom Z3801A, User Manual

Page: 38 / 98

Chapter 2 Features and Functions
Outputs
2-8 User Guide
RS-422 Serial Port, I/O Port 1 J3
The 25-pin female D Subminiature (DB-25) connector located on the
rear panel provides RS-422 serial communications capability.
This can be used by connecting a DCE device with an RS-422 serial
interface port (wired to interface with the receiver's I/O port as listed in
Table 2-3) and suitable terminal emulation software, then sending the
correct commands for transmitting or retrieving data. You can
customize the Receiver on installation, to change the Receiver’s
operating characteristics, retrieve Receiver state information, and
clear the stored data. The pins used are described in Table 2-3.
*All other pins, no connection.
Table 2-3. Rear-Panel RS-422 Serial Port/10 MHz/1PPS Pin
Assignments
*Pin Number Input/Output Description
1 Cable Shield
2 (A),
14 (B)
Output Transmit Data (TxD)—GPS Receiver
output RS-422 (per RS-530)
3 (A),
16 (B)
Input Receive Data (RxD)—GPS Receiver
input RS-422 (per RS-530)
7 ——— Signal Ground (SG)
15
12
10 MHz_1-
10 MHz_1+
Differential pseudo ECL
10 MHz output
11
24
10 MHz_2-
10 MHz_2+
Differential pseudo ECL
10 MHz output
17
9
1 PPS/_1-
1 PPS/_1+-
Differential pseudo ECL
1 PPS output
8
21
1 PPS/_2-
1 PPS/_2+
Differential pseudo ECL
1 PPS output