Pro-face RHAA091: COM1 Checksum error response for Multilink command

Pro-face HMI Major Communication

Model: GP4000/SP5000 Series | Code: RHAA091

Applicable Systems
GP4000 Series

Symptoms

  • GP-Pro EX display unit shows error RHAA091: COM1 Checksum error response for Multilink command.

Possible Causes

  • A checksum error occurred in a Multilink command response.

Troubleshooting Steps

  1. Step 1: Verify communication settings.
    Communication restored and error cleared

How to Reset

Repower or reset the display unit after correcting the root cause.

Related Pro-face Fault Codes

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Source: Pro-face GP-Pro EX Maintenance/Troubleshooting Manual, T.7.1 Common Display errors (proface.tech/otasuke official)

Category: HMI