Optional Rear Rs485 (Com3); Optional Rear Rs232 (Com3) - Siemens 7SR23 DAD Manual

2.1.4

Optional Rear RS485 (COM3)

USB or 9 pin male
Laptop computer
RS232 straight
through cable
Figure 2-5 Additional (Optional) Rear RS485 + IRIG-B Connection to a PC
2.1.5

Optional Rear RS232 (COM3)

Figure 2-6 Additional (Optional) Rear RS232 + IRIG-B Connection to a PC
Pin
1
2
3
4
5
6
7
8
9
Figure 2-7 RS232 Data Comms Pin Connections
©2013 Siemens Protection Devices Limited
D connector
Relay Function
Not Connected
Receive Data (RXD)
Transmit Data (TXD)
Output Supply +5V 50mA
Signal Ground (GND)
Output Supply +5V 50mA
Linked to 8 (volts free)
Linked to 7 (volts free)
Output Supply +5V 50mA
Chapter 4) 7SR23 DAD Data Communications
IRIG-B
COM3
RS485 Screened
TERM
twisted pair
Chapter 4 Page 12 of 54
7SR24
COMMS MODULE
GND
B
A