Product:Honeywell 621-9938 Serial I/O Module (SIOM) With One year warranty

DIP switch banks, SW1 and SW2, select rack configuration and output handling. Three DIP switch banks, SW3, SW4, SW5 set the number of I/O points used in each I/O rack slot. The 621-9937 replaces the 621-9930. See Appendix B for information on the 621- 9930. SERIAL INPUT/OUTPUT MODULE (SIOM) Model No. - 621-9938,621-9940 The 621-9938 has two serial ports and the 6209940 has one. The 621-9938 is used in redundant applications which require communication with redundant processors. The 621-9938 frontplate has six

(SLM) 621-9939 and Serial I/O Module (SIOM) 621-9938 or 621-9940. The two systems are not compatible. Information pertaining to the superseded system, which is not obsoleted, is included in Appendix B. SERIAL I/O SPECIFICATIONS DATA TRANSFER MEDIUM Serial 4-wire full duplex (asynchronous to processor scan) DATA RATE 115.2K baud ELECTRIC AL FORMAT RS422 SERIAL CHANNEL SCAN RATE Depends on the number of racks per link, number of discrete points per link, number of racks containing PUSH/PULL cards and the number of PUSH/PULL cards

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