And then Danielli slid into the corner after a fine passing movement from the Bath backs.
BBC: SPORT | Rugby Union | European Club | Montferrand 38-22 Bath
Simon Danielli (2), Mark McCrea, Darren Cave and Bryn Cunningham added further tries in a dominant display.
Scotland won a penalty when Rob Kearney was put under pressure by Simon Danielli and Nick de Luca.
Thom Evans comes in on the left wing with John Barclay, Simon Danielli and Graeme Morrison dropping out.
Danielli pierced the home defence for the second try in the 23rd minute.
The ball was quickly recycled and spun left where Trimble passed to Danielli who juggled it before diving over.
Wing Simon Danielli, fly half Dan Parks and lock Scott MacLeod are injury doubts but are expected to be fit.
Danielli gave Ulster an unlikely lead thanks to a strong run to the left corner from Tommy Bowe's short pass.
Scotland winger Simon Danielli was the inspiration for the home side, breaking through the defence before the ball was offloaded to Ferris.
Scotland wing Simon Danielli scored a fine try in a man-of-the-match display.
Danielli burst clear form halfway and outpaced Gavin Duffy to touch down in corner for Ulster's fifth converted try with 10 minutes left.
There are five other changes to the starting XV, with Rory Lamont replacing Simon Danielli, while Mike Blair is captain for the 14th time.
BBC: Scotland add Greig Laidlaw to squad for All Blacks game
Following last weekend's 24-16 victory in Tucuman, winger Simon Danielli wins his 26th cap and replaces Nick de Luca, who drops to the bench.
Scottish wing Danielli, the replacement for Nagusa, took a Humphreys pass before cutting through the middle for a converted try in the 53rd minute.
Simon Danielli's run earned Ulster a penalty on 32 minutes, with Andrew Farley infringing, and Wallace punished the indiscretion to double the away side's advantage.
Danielli's second sealed the result after good work from Timoci Nagusa.
Ulster, beaten 48-17 away to the Ospreys a week earlier, produced a much better display and led 8-6 at the break with Simon Danielli scoring a try.
Some good Ulster passing set Simon Danielli up for the third try before Pienaar burst through to complete the job and bag the fifth Pool Four point.
Three days after the departure of coach Mark McCall, Ulster made a strong start and tries by Kieron Dawson and Simon Danielli had them 17-9 up at half-time.
Italy winger Andrea Masi was lucky not to be yellow-carded for a tackle that was not only high but off the ground as Simon Danielli jumped to catch.
In addition, he is encouraged by the form of Sean Lamont at Scarlets and Hugo Southwell at Stade Francais and by the imminent return from injury of Simon Danielli.
BBC: Robinson urges Scots to make history against All Blacks
Nagusa did excellently to free his arms as he was tackled, finding Ian Whitten who off-loaded to Danielli for the wing's second try, although this time it went unconverted.
The fly-half's break led to the opening try for lock Dan Tuohy and also picked off an Ospreys pass for Simon Danielli to claim the first of his two scores.
And head coach Andy Robinson hopes Danielli's try-scoring form with Ulster and his strength and pace will ensure Scotland capitalise on their possession and break down the home side's defence.
The best of their chances came in the dying minutes when Jonny Shiels raced into space, but his pass to Simon Danielli was not the best and the opening went untaken.
Humphreys missed the tricky conversion but was soon helping his side rack up more points, after intercepting Jonny Vaughton's pass and sprinting upfield before finding Danielli - Humphreys also adding the extras.
After Ian Humphreys had extended the Ireland lead, Ben Cairns thought he had replied for the Scots but John Houston, a late replacement for Simon Danielli, was adjudged to have thrown a forward pass.
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