Omron CJ1W-SCU22 — CJ High-Speed Serial, 2 x RS-232C
SKU: CJ1W-SCU22USD 170.00
CJ-series SCU@2 high-speed serial unit with two RS-232C ports, 5 VDC backplane, up to 230.4 kbps, host link / NT link / Modbus-RTU slave.
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Product Overview
The Omron CJ1W-SCU22 is the CJ-series high-speed (SCU@2) CPU-bus serial communication unit with two RS-232C ports. Pick the SCU22 when a CJ cabinet has two RS-232C devices that need a faster link than the standard 38.4 kbps ceiling -- the SCU@2 family extends each port up to 230.4 kbps and gives faster CPU-side data transfer. The unit slots into any CPU-bus position on the CJ1 / CJ2 rack, pulls 0.28 A from the 5 VDC backplane (no external supply), and runs both ports independently with separate protocols.
SCU@2 high-speed vs SCU-V1 standard-speed
The SCU22 / SCU32 / SCU42 family is the @2 high-speed type -- 230.4 kbps on each port and faster CPU-side hand-off. The SCU-V1 family (SCU21-V1, SCU31-V1, SCU41-V1) tops out at 38.4 kbps. If 57.6 / 115.2 / 230.4 kbps is needed, pick the SCU@2 type. The SCU32 is the 2x RS-422A / 485 sibling; the SCU42 is the mixed-port sibling.
Per-port protocols
On a CJ system, each port sets independently to protocol macro, Host Link (SYSWAY for CX-Programmer upload or a SYSWAY master), NT Link 1:N for an NS / NB HMI panel, serial gateway (auto FINS / Host Link / Modbus-RTU conversion), no-protocol (raw byte send / receive), or Modbus-RTU slave. The SCU is only a Modbus-RTU SLAVE, not a master. The serial gateway is the typical pick when a third-party sensor / inverter needs to land on the CPU as FINS. On an NJ CPU the per-port list drops Host Link and NT Link.
Before ordering
Confirm the CJ rack has a free CPU-bus unit slot. Up to 16 SCUs / 32 serial ports per system. The SCU22 is NOT hot-swappable; mount or replace with the CJ rack powered off. For long-distance RS-422A / RS-485 1:N, attach the NT-AL001 RS-232C to RS-422A link adapter to a port (each NT-AL001 adds 0.15 A to the draw).
Key Features
- CJ-series SCU@2 HIGH-SPEED serial communication unit with TWO RS-232C ports on D-Sub 9-pin connectors
- Up to 230.4 kbps per port in SCU@2 high-speed mode (the standard SCU2x-V1 family tops out at 38.4 kbps)
- Two independent RS-232C point-to-point links up to 15 m cable run
- Each port sets independently: protocol macro, host link, NT link (1:N), serial gateway, no-protocol, Modbus-RTU slave
- 5 VDC 0.28 A from the CJ backplane -- no separate power supply required (each NT-AL001 adapter on a port adds 0.15 A)
- Modbus-RTU acts as SLAVE only -- the SCU does not act as a Modbus-RTU master
- RS-422A / RS-485 1:N multidrop via the NT-AL001 link adapter on each RS-232C port (the SCU22 has no RS-422A port built in)
- COMM1 / COMM2 + RUN / ERC front-panel LEDs
- Up to 16 SCUs per CJ rack, up to 32 serial ports per system
- Mounts in any CJ CPU-bus unit slot (CJ1M / CJ1H / CJ2H / CJ2M / NJ CPU racks)
- Pair with the NT-AL001 RS-232C to RS-422A / RS-485 link adapter for 1:N multidrop
- Not hot-swappable -- mount or replace with the CJ rack powered off
- Distinguishing feature vs SCU21-V1: SCU22 is the @2 high-speed 230.4 kbps sibling; SCU21-V1 is 38.4 kbps standard
- SKU: CJ1W-SCU22
- Series: CJ-series CPU Bus Serial Communication Unit, SCU@2 high-speed type
Best-Fit Applications
- Two RS-232C devices on one CJ CPU where one or both need a faster link than 38.4 kbps (e.g. 115.2 kbps serial-label printer or 230.4 kbps barcode reader)
- High-speed serial gateway from a third-party Modbus-RTU inverter / temperature controller to a CJ1 CPU as FINS
- Two Host Link master ports for connecting to older C-series or C200H PLCs on a migration retrofit at 57.6 kbps or 115.2 kbps
- Pick the SCU-V1 standard-speed family instead (SCU21-V1 / SCU31-V1 / SCU41-V1) when 38.4 kbps is enough -- the SCU@2 commands a price premium
- Pick the SCU32 instead when the two high-speed ports need to be RS-422A / RS-485 instead of RS-232C (long-distance multidrop at 230.4 kbps)
Buying Checklist
- Pick CJ1W-SCU22 for two RS-232C ports on a CJ CPU bus at up to 230.4 kbps per port with 0.28 A backplane draw.
- Pick CJ1W-SCU21-V1 instead when 38.4 kbps is enough on a standard-speed 2x RS-232C port build.
- Pick CJ1W-SCU32 instead for two RS-422A / RS-485 ports at 230.4 kbps (long-distance multidrop).
- Pick CJ1W-SCU42 instead for one RS-232C + one RS-422A / RS-485 mixed-port high-speed build.
- Pick the NT-AL001 link adapter to convert an RS-232C port on the SCU22 to RS-422A for 1:N multidrop (adds 0.15 A per adapter).
- Confirm the CJ rack has a free CPU-bus unit slot and that the CJ1W-PA205R / PD025 PSU can carry the SCU stack.
Technical Specifications
| Series | CJ-series CPU Bus Serial Communication Unit, SCU@2 high-speed type |
|---|---|
| Model | CJ1W-SCU22 (two RS-232C ports, high-speed) |
| Port 1 / Port 2 | RS-232C, D-Sub 9-pin connector |
| Modes | Full duplex RS-232C, point-to-point |
| Communication Speed | 1,200 to 230,400 bps (SCU@2 high-speed); standard 38,400 bps on the SCU-V1 sibling |
| Cable Distance | RS-232C 15 m; RS-422A / RS-485 500 m via NT-AL001 adapter on each port |
| Power | 0.28 A from 5 VDC CJ backplane (+0.15 A per NT-AL001 adapter fitted) |
| Protocols per Port (CJ mode) | Protocol macro, host link, NT link 1:N, serial gateway, no-protocol, Modbus-RTU slave |
| Modbus Role | SLAVE only (the SCU does not act as a Modbus-RTU master) |
| Mounting | One CJ CPU-bus unit slot, DIN-rail |
| System Capacity | Up to 16 SCUs per CJ rack, up to 32 serial ports per system |
| Approvals / Origin | UC1 / N / L / CE; MADE IN JAPAN |
Resources & Downloads
FAQ for CJ1W-SCU22
What is the difference between CJ1W-SCU22 and CJ1W-SCU21-V1?
The SCU22 is the SCU@2 HIGH-SPEED type with an RS-232C top speed of 230.4 kbps per port. The SCU21-V1 is the STANDARD-speed type with a top speed of 38.4 kbps per port. Both carry two RS-232C ports on D-Sub 9-pin connectors and pull 0.28 A from the 5 VDC CJ backplane. Both run the same per-port protocol set. Pick the SCU22 when a device needs more than 38.4 kbps (a high-speed serial-label printer, a vision system, a barcode reader with image-data output) or when a panel wants the faster CPU-side data transfer of the @2 family. Pick the SCU21-V1 when 38.4 kbps is enough -- it is the cheaper and more common pick for Modbus-RTU slaves and Host Link masters.
What protocols does each SCU port support?
On a CJ1 / CJ2 system, each port can independently run protocol macro (a sequence of predefined send / receive messages), host link (SYSWAY-compatible, for CX-Programmer upload or a third-party SYSWAY master), NT link 1:N (for an NS / NB HMI on the same rack), serial gateway (auto FINS / Host Link / Modbus-RTU conversion), no-protocol (raw byte send / receive), or Modbus-RTU slave (the SCU acts only as a slave, not as a master). On an NJ-series CPU the per-port list drops to protocol macro, serial gateway, no-protocol and Modbus-RTU slave -- host link and NT link are not supported on the NJ via the SCU.
Can the SCU22 be a Modbus-RTU master?
No. The SCU22 Modbus-RTU mode is slave only. The SCU does not act as a Modbus-RTU master to third-party slaves. For a Modbus-RTU master port on the CJ CPU, use the CJ1W-SCU42 mixed-port sibling (with the Modbus-RTU master on the RS-422A / RS-485 port) or fit a CP1W-CIF12 isolated RS-485 option board to a CP-series CPU option-board slot. The Modbus-RTU slave is the typical pick when a third-party sensor / inverter / power meter needs to land on the CPU as FINS via the serial-gateway mode.
Is the CJ1W-SCU22 hot-swappable?
No. Like every other CJ CPU-bus unit, the SCU22 must be mounted or replaced with the CJ rack powered off. Hot-swapping a CPU-bus unit on a live rack can corrupt the cyclic I/O refresh and trip the CPU into a fatal error. Confirm the rack is powered off before fitting the SCU22. For communications modules that need to ride a live rack -- typically networking -- move to a CJ-series Ethernet or EtherNet/IP option that supports the planned handling on a per-customer basis.
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