Instruction manual

Page 12 Z-12 Real-Time Sensor Operation and Reference Manual
Table 2.3 lists the signal parameters for the three DB9 connectors.
Table 2.3: DB9 RS-232 Connector Pinouts
Port Pin Signal Description
A 1 DCD1 Data Character Detect for port 1
2 RXD1 Receive Data for port 1
3 TXD1 Transmit Data for port 1
4 +12V1 Supply output for radio. Acts as DTR if necessary.
5 GND1 Signal Ground for port 1
6 DSR1 Data Set Ready for port 1
7 RTS1 Request To Send for port 1
8 CTS1 Clear To Send for port 1
9 1PPS One Pulse Per Second output. Synchronized with GPS time.
B 1 DCD2 Data Character Detect for port 2
2 RXD2 Receive Data for port 2
3 TXD2 Transmit Data for port 2
4 +12V2 Supply output for radio. Acts as DTR if necessary.
5 GND2 Signal Ground for port 2
6 DSR2 Data Set Ready for port 2
7 RTS2 Request To Send for port 2
8 CTS2 Clear To Send for port 2
9 EVENT Event marker input. This is a high pulse to time-tag the output log
data.
C 1 NC No connection
2 RXD3 Receive Data for port 3
3 TXD3 Transmit Data for port 3
4 +12V3 Supply output for radio. Acts as DTR if necessary.
5 GND3 Signal Ground for port 3
6 NC No connection
7 RTS3 Request To Send for port 3
8 CTS3 Clear To Send for port 3
9 BOOT For ce b oot load:
 Open or highno action
 Low or power oninitiates a memory reset or a boot load
through port 1. See firmware description for more
information.