Siemens FS20 - Page 193

Mounting and installation of the compact control panels
Event printer
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Building Technologies
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Fire Safety
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Connection of event printer to RS232 module
Connector From printer To Terminal X3 of RS232 module
3 Data (white) => (X3) PIN 6 (CTS)
Data (brown) => (X3) PIN 4 (RXD)
Data (green) => (X3) PIN 2 (TXD)
Data (yellow) => (X3) PIN 5 (0 V)
Table 4: Pin assignment for RS232 module