USB Serial Adapter User's Manual
Contents
1. Outside the unit there are sixteen 4 pin DIP switches which are set to select the mode of operation You will need to set the switch settings to RS 232 mode or RS 422 or RS 485 mode as per the requirements of your application You need to install driver first prior to hardware installation After the setting of DIP switches and connecting power cord to the adapter you then plug the adapter to USB port to start driver installation The Mode Block Configuration Settings are listed as follows SW1 Port 1 SW2 Port 2 SW3 Port 3 SW4 Port 4 SW5 Port 5 SW6 Port 6 SW7 Port 7 SW8 Port 8 SW9 Port 9 SW10 Port 10 SW11 Port 11 SW12 Port 12 SW13 Port 13 SW14 Port 14 SW15 Port 15 SW16 Port 16 RS 232 Standard RS 232 Mode OFF 5 422 4 wire with Handshaking nj non RS 485 Full Duplex 4 wire Jor ON ON ON T Half Duplex 2 wire ON O FF OFF OFF with Echo Half Duplex 2 wire ON FF OFF OFF OFF without Echo JP5 Port 1 JP6 Port 2 JP7 Port 3 JP8 Port 4 JP9 Port 5 JP10 Port 6 JP11 Port 7 JP12 Port 8 JP13 Port 9 JP14 Port 10 JP15 Port 11 JP16 Port 12 JP17 Port 13 JP18 Port 14 JP19 Port 15 JP20 Port 16 for Termination and Biasing Option Configuration Inside the unit there are sixteen 2 x 7 14 pin header blocks which are jumpered to enable Tx Rx CTS 120 Ohm termination resistors and Tx Rx 750 O2. hm BIASing resistor You will need to open up the metal case and set the jumper setting for RS 422 mode or RS 485 mode as per the requirements of your application Settings are listed as follows 01 02 11 Tx Termination of 120 Ohm This jumper should always be populated for RS 485 mode Pull up Tx to VCC by 750 Ohm Bias resistor This jumper should be populated for pull up Tx 4 5 6 7 8 Pull down to GND by 750 Ohm Bias resistor This jumper should be populated for pull down Tx Rx Termination of 120 Ohm This jumper should always be populated for RS 422 mode 09 10 11 Pull up Rx to VCC by 750 Ohm Bias resistor This jumper should be populated for pull up Rx 11 12 11 Pull down Rx to GND by 750 Ohm Bias resistor This jumper should be populated for pull down Rx 3 14 CTS Termination of 120 Ohm This jumper should always be populated for RS 422 mode Note Sometimes when operating in RS 422 or RS 485 it is necessary to configure termination and biasing of the data transmission lines Generally this must be done in the cabling since this depends on the installation of connections Before applying the option check your cable specification for proper impedance matching RS 232 422 485 Pin outs amp Signals Wirino RS 422 Signal Pin outs of DB 9 Male RS 422 Signal Wiring Point to Point 4 Wire Full Duplex USB 16COMi RM RS 422 Device 2 TxD B 4 RxD B 1 T
3. xD A 4 RxD A 3 RxD B lt _ gt TxD B 4 RxD A 4 TxD A 5 GND lt GND RS 422 with Handshaking USB 16COMi RM RS 422 Device TxD B lt RxDt B TxD A 4 9 RxD RxD B TxD B RxD A TxD A GND lt GND RTS B 4 CTS B RTS A 4 CTS A CTS B lt gt RTS B CTS A 4 RTS A ho RS 485 4 Wire Full duplex Signal Pin outs of DB 9 Male RS 485 2 Wire Half duplex Signal Pin outs of DB 9 Male RS 485 Signal Wiring Point to Point 4 Wire Full Duplex USB 16COMi RM RS 485 Device TXHB 4 Rx B lt gt Rx A Rx B 4 Txt B Rx A lt Tx A GND gt GHO e Multidrop RS 485 2 Wire Half duplex USB 16COMi RM RS 485 Device 2 Datat B Datat B 1 Data A Data A GND a gt GND RS 485 Device x Datat B Data A GND
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