Optional Rear Rs485 + Irig-B Interface; Optional Rear Rs232 + Irig-B Connection; Figure 2-5 Additional (Optional) Rear Rs485 + Irig-B Connection To A Pc; Figure 2-6 Additional (Optional) Rear Rs232 + Irig-B Connection To A Pc - Siemens 7SR21 Manual

2.1.4

Optional Rear RS485 + IRIG-B Interface

Figure 2-5
2.1.5

Optional Rear RS232 + IRIG-B Connection

USB or 9 pin male
Laptop computer
RS232 cross-over
cable or RS232 to
USB converter
Figure 2-6
Pin
1
2
3
4
5
6
7
8
9
©2010 Siemens Protection Devices Limited
Additional (Optional) Rear RS485 + IRIG-B Connection to a PC
D connector
cable
Additional (Optional) Rear RS232 + IRIG-B Connection to a PC
Relay Function
Not Connected
Receive Data (RXD)
Transmit Data (TXD)
Input Supply +5 V
Signal Ground (GND)
Input Supply +5 V
Linked to 8 (volts free)
Linked to 7 (volts free)
Output Supply +5 V 50mA
Figure 2-7 RS232 Data Comms Pin Connections
7SR21 & 7SR22 Data Communications
IRIG-B
COM 3
Rear Connector
Chapter 4 Page 11 of 15