Omron CJ1W-SCU42 — CJ SCU@2 Mixed-Port, 1 RS-232 + 1 RS-485
SKU: CJ1W-SCU42USD 158.00
CJ-series SCU@2 high-speed mixed-port serial unit: 1 x RS-232C and 1 x RS-422A/485. 230.4 kbps, 0.36 A.
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Product Overview
The Omron CJ1W-SCU42 is the mixed-port member of the CJ SCU@2 high-speed serial communication family. Pick it when one cabinet needs one RS-232C point-to-point line and one RS-422A / RS-485 multi-drop line in a single module.
The front face carries COMM1 (RS-232C on a D-Sub 9-pin connector) and COMM2 (RS-422A / RS-485 on a removable 5-pin terminal block). Each port sets independently to protocol macro, Host Link, NT Link 1:N, serial gateway, no-protocol, or Modbus-RTU slave, and runs up to 230.4 kbps in SCU@2 high-speed mode (the standard SCU-V1 family tops out at 38.4 kbps).
Power comes from the CJ backplane at 0.36 A on 5 VDC. The RS-232C port reaches 15 m on a standard cable; the RS-422A / RS-485 port reaches 1,200 m, which is the SCU@2 high-speed advantage over the SCU-V1 standard-speed 500 m ceiling. Add an NT-AL001 RS-232C-to-RS-422A link adapter to convert a port to 1:N long-distance RS-422A comms.
The unit takes one CJ CPU-bus slot (the CJ CPU-bus spec permits up to 16 CPU-bus high-function units per rack / 32 serial ports per system when SCUs are stacked). It is NOT hot-swappable, and Modbus-RTU acts only as a slave. CX-Protocol (CX-Programmer add-on) and CX-Programmer over Ethernet (when a CJ1W-ETN21 or CJ1W-EIP21 sits elsewhere on the rack) cover setup.
Approvals: UC1, N, L, CE. Made in Japan.
Key Features
- CJ-series SCU@2 high-speed CPU-bus serial communication unit
- One RS-232C port on D-Sub 9-pin connector (COMM1) + one RS-422A / RS-485 port on 5-pin terminal block (COMM2)
- Per-port protocol: protocol macro, Host Link, NT Link 1:N, serial gateway, no-protocol, Modbus-RTU SLAVE
- Up to 230.4 kbps per port in SCU@2 high-speed mode (standard SCU-V1 family tops at 38.4 kbps)
- RS-232C cable 15 m; RS-422A / RS-485 cable 1,200 m (SCU@2 advantage over standard 500 m)
- Attach NT-AL001 RS-232C-to-RS-422A link adapter for 1:N long-distance RS-422A chains
- 0.36 A from 5 VDC CJ backplane
- Up to 16 CPU-bus units / 32 serial ports per CJ rack
- NOT hot-swappable; Modbus-RTU acts only as slave
- On an NJ-series CPU, per-port protocol drops to protocol macro / serial gateway / no-protocol / Modbus-RTU slave
- Approvals: UC1, N, L, CE
- Made in Japan
- SKU: CJ1W-SCU42
- Series: CJ-series CPU-bus high-function unit, SCU@2 high-speed family
Best-Fit Applications
- One RS-232C point-to-point link to a barcode scanner + one RS-422A / RS-485 multi-drop to VFDs
- Mixing Host Link on the RS-232C port with Modbus-RTU slave on the RS-485 port in the same CJ rack
- Long-distance (up to 1,200 m) RS-422A / RS-485 chains where the SCU-V1 500 m would not reach
- Adding serial gateway routing from a CJ PLC to a Modbus-RTU slave field device
- Skid-mount controller where COMM2 needs a screw-terminal RS-485 and COMM1 needs a D-Sub RS-232C
- Protocol-macro custom message exchange on the RS-232C port while RS-485 runs a standard protocol
Buying Checklist
- Pick the CJ1W-SCU42 when one cabinet needs one RS-232C and one RS-422A / RS-485 port in a single high-speed (230.4 kbps) module.
- Pick the CJ1W-SCU22 instead when both ports should be RS-232C.
- Pick the CJ1W-SCU32 when both ports should be RS-422A / RS-485.
- Pick the CJ1W-SCU41-V1 for a mixed-port module on the standard-speed (38.4 kbps / 500 m RS-422A) family.
- Pick the CJ1W-SCU21-V1 when the cabinet only needs RS-232C on the standard-speed family.
- Confirm spare CJ CPU-bus slots — the SCU42 takes one slot and counts toward the 16-units-per-rack limit.
Technical Specifications
| Series | CJ-series CPU-bus high-function unit, SCU@2 high-speed family |
|---|---|
| Model | CJ1W-SCU42 |
| Ports | 1 x RS-232C (D-Sub 9-pin) + 1 x RS-422A / RS-485 (5-pin removable terminal block) |
| Max Baud Rate | 230.4 kbps per port (SCU@2 high-speed) |
| Cable Run | RS-232C 15 m; RS-422A / RS-485 1,200 m |
| Protocols (CJ1 system) | Protocol macro, Host Link, NT Link 1:N, serial gateway, no-protocol, Modbus-RTU slave |
| Protocols (NJ system) | Protocol macro, serial gateway, no-protocol, Modbus-RTU slave (Host Link and NT Link not supported) |
| Current Draw | 0.36 A at 5 VDC from CJ backplane |
| Per-rack Limit | Up to 16 SCU / high-function CPU-bus units / 32 serial ports per CJ rack |
| Hot-Swap | Not supported |
| Dimensions | 31 x 90 x 65 mm (slim CJ CPU-bus form factor) |
| Approvals | UC1, N, L, CE |
Resources & Downloads
FAQ for CJ1W-SCU42
What is the difference between CJ1W-SCU42 and CJ1W-SCU41-V1?
SCU42 is on the SCU@2 high-speed family (up to 230.4 kbps, RS-422A / RS-485 cable runs to 1,200 m). SCU41-V1 is on the SCU-V1 standard-speed family (up to 38.4 kbps at standard mode / 115.2 kbps at high-speed mode, RS-422A / RS-485 cable runs to 500 m). Both carry one RS-232C and one RS-422A / RS-485 port. Pick SCU42 for new high-speed builds; pick SCU41-V1 as a like-for-like spare on an existing standard-speed rack.
Is the CJ1W-SCU42 hot-swappable?
No. CJ-series SCUs are not hot-swappable — power the rack down before inserting or removing an SCU42. (The SRT2-series SmartSlice I/O blocks and a few CS1D duplex modules support hot-swap; the CJ1W-SCU42 does not.)
Can the CJ1W-SCU42 act as a Modbus-RTU master?
No. The SCU42 lists Modbus-RTU SLAVE in its per-port protocol menu, not master. Use the SCU as a slave and let the CJ CPU scan it via the serial gateway, or use a dedicated master module if the field device is a slave that the PLC needs to poll.
How many CJ1W-SCU42 units can sit on one CJ rack?
Up to 16 CPU-bus high-function units per CJ / CJ2 rack (CPU plus expansion racks), which gives up to 32 serial ports in the system when SCUs are the limiting factor. Confirm spare slots when planning a multi-SCU build.
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