Issac Thomas Newbigging, 27, appeared via video link from Bathurst Correctional Centre in Dubbo Local Court on Wednesday.

Newbigging sobbed while applying for bail for the first time since being into custody on Christmas eve, charged with a number of offences including assaulting a police officer, affray, damaging property and breaching an apprehended violence order.

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Police prosecutor Sergeant Rob Wilkin opposed bail for the "viciousness" of the alleged attack.

Police allege Newbigging punched a senior constable repeatedly in the head, knocking him unconscious, as he responded to reports of a domestic dispute at a home on Merilba Street in Narromine.

It's alleged Newbigging then took the officers radio and smashed the police vehicle's windscreen before throwing it across the road.

Mr Wilkin told the court it was a "severe and savage attack" and warranted a jail sentence to help send a clear message about the seriousness of abuse to emergency service workers.

"[The senior constable] had to barricade himself inside a police vehicle and wait for further assistance," Mr Wilkin said.

"The defendant was acting unpredictable, it was a savage attack against a police officer where he disabled his manner of communication.

"The behaviour then continued with ambulance officers."

Newbigging's defence lawyer Jessica Kitch said he was "struggling quite badly" with schizophrenia and had not been receiving medication.

"In my conversations with him it appears he's in quite a depressive mood, he's scared, he's unmediated," Ms Kitch told the court.

Mr Wilkin however told the court that Justice Health informed him when Newbigging entered custody he refused to sign documents which would allow him to receive medication.

Ms Kitch said this was because he had been in a heightened state of mental distress, and told the court the incident began after he breached an AVO put in place to protect his mother, who was also sobbing in court and supporting his application for bail.

Newbigging's lawyer told the court he had "no record" of the incident, and had appeared before the Mental Health Review Tribunal.

"Talking with his mother she's seen a different side. He now has insight into his condition and needs support for that," Ms Kitch said.

"Prior to this incident he didn't have the wrap around support... he does now."

Magistrate Malcom MacPherson agreed it was a "vicious assault" which rendered a police constable unconscious, but acknowledged Newbigging suffered a chronic mental illness which needed to be addressed.

"If he's not getting proper medication in custody that's a real concern," he said.

Magistrate MacPherson ordered Newbigging to the Bloomfield mental health facility in Orange where he will be detained and assessed.

If found not to be mentally ill, the matter will be bought back to court.