The banks involved in the Brinks Allied ATM dispute said disruption to the public would be limited over the weekend despite the continuing industrial action.
Brinks Allied delivers cash to branches of AIB, Bank of Ireland the Ulster Bank in Dublin and other east coast areas.
The Irish Payment Services Organisation, which represents the banking sector, was last night confident that the public would not be greatly affected over the weekend by the dispute.
An IPSO spokeswoman, Ms Una Dillon, said: "The outlook for the weekend is looking very positive. The banks have been able to deal quite well with the problem, and we are confident that the vast majority of ATMs will operate as normal throughout the weekend."
Ulster Bank last night said it expected 22 of its 90 non-branch east coast ATMs would not be operating over the weekend. It said all of its branch-based ATMs would operate.
"We expect to be very comfortable throughout the weekend, but come Monday we will have to monitor the situation on a day-to-day basis," an Ulster Bank spokeswoman said.
Yesterday, SIPTU members involved in the dispute voted by 58 to eight to be available to provide a full range of services at Brinks Allied except working the four Dutch vehicles imported by management last week.
However, when told of the outcome of the ballot by SIPTU security services branch secretary Mr Kevin McMahon, and of the union's continued willingness to discuss issues at the Labour Relations Commission and Labour Court, the company said it would not allow a resumption of normal working by employees.
After meeting the company, Mr McMahon said: "This is a lock-out, and we will be balloting our members for industrial action next week. We have been acting reasonably throughout this dispute. Today's ballot was to clarify that our members are committed to carrying out their duties fully."
He welcomed a decision by the company to return to the Labour Relations Commission for further discussions. This course was suggested by SIPTU on Wednesday after the company changed its mind about attending the Labour Court.
The union meets the company again on Monday afternoon to try to break the impasse.
Despite numerous attempts to contact a spokesman, the company has declined to comment.