6420-001-N-N PACIFIC SCIENTIC Driver


Manufacturer: Pacific
Model: 6420-001-N-N
Product name: Driver
Warranty: One year warranty

Category: SKU: 6420-001-N-N Tag:
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6420-001-N-N PACIFIC SCIENTIC Driver

6420-001-N-N PACIFIC SCIENTIC Driver


The 6420-001-N-N supports single-unit RS-232, RS-422 and multi-unit RS-485 communication protocols running at 9600 bps, 1 start bit, 1 stop bit. RS-232 and RS-422 mode selection is automatic dependent upon whether connections are made to the single-ended RS-232 TX and RX lines or to the differential TX and RX lines. RS-485 mode is jumper selected and allows up to 32 units on a single differential RS-485 communications link. The host computer is the bus master and always initiates packet transfers. External termination may be required in some installations. The unit is factory configured for RS-232 protocol. The table below shows the Serial Port pin designations.

Solder connections to TXD_485± and RXD_485 ± differential lines. After installing the power and serial communications cable you can quickly test the unit by applying power and pressing and then the space bar. You should see the Pacific Scientific sign-on message and copyright notice. Build the cable to connect to your computer or terminal by referring to the documentation for the device.

Note: Pinouts vary among computer manufacturers. Check your computer’s hardware reference manual before wiring.

Solder connections to TXD_485± and RXD_485 ± differential lines. This mode requires each 6420-001-N-N to be initialized with a single-letter node address to be used with each subsequent command. This node address must be setup in Single-Unit mode before the RS-485 mode operation is attempted. To set this address, perform the following:


1. Apply power and press a key (a-z, A-Z) NOT the Spacebar, to be used as the address followed by a single space. Execute the P command to program the node address into non-volatile memory.

2. Power-down the unit and insert jumper E11 to configure the unit for RS-485 mode. There is no sign-on procedure while in RS-485 multi-unit mode. This mode is designed to be used with a host computer, but can be tested using a terminal.

3. Type in the node address. The character should be echoed if the unit recognizes the address.

4. Type a simple motion command, R 500 followed by a (line feed) terminating character (press ). The motor should now run.

Note: Units configured for single-unit RS-232 or RS-422 always have the serial drive lines enabled. Therefore, avoid connecting one of these units into a chain of RS-485 configured units.

Digital communication is a trend that represents technological progress and cannot be stopped by anyone. Just like the current DCS and the new PLC, due to years of development and research, they both retain their original characteristics and complement each other to form a new system. The current DCS is no longer the original DCS, and similarly, the new PLC is not the initial PLC in development. The three major control systems are interdependent and promote the continuous development of industrial automation. Basic characteristics of PLC control system:
(1) The development from on-off control to sequential control and transportation processing is from bottom to top.
(2) Multiple functions such as continuous PID control, PID in the interrupt station.
(3) A single PC can be used as the master station, and multiple PLCs of the same type can be used as slaves.
(4) It is also possible to have one PLC as the master station and multiple PLCs of the same type as the slave stations, forming a PLC network. The convenience of using a PC as the main station is that when users program, they do not need to know the communication protocol, as long as they write it in the format specified in the manual.
(5) The PLC grid can serve as both an independent DCS/TDCS and a subsystem of DCS/TDCS.
(6) Large systems are the same as DCS/TDCS, such as TDC3000, CENTUMCS, WDPFI, and MOD300.
(7) PLC networks such as Siemens’ SINEC-L1, SINEC-H1, S4 (wrong, remove), S5, S6 (wrong, remove), S7, etc., GE’s GENET, Mitsubishi’s MELSEC-NET, MELSEC-NET/MINI.


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